Abstract Class yii\log\Target

Inheritanceyii\log\Target » yii\base\Component » yii\base\BaseObject
Implementsyii\base\Configurable
Subclassesyii\log\DbTarget, yii\log\EmailTarget, yii\log\FileTarget, yii\log\SyslogTarget
Available since version2.0
Source Code https://github.com/yiisoft/yii2/blob/master/framework/log/Target.php

Target is the base class for all log target classes.

A log target object will filter the messages logged by yii\log\Logger according to its $levels and $categories properties. It may also export the filtered messages to specific destination defined by the target, such as emails, files.

Level filter and category filter are combinatorial, i.e., only messages satisfying both filter conditions will be handled. Additionally, you may specify $except to exclude messages of certain categories.

Public Properties

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Property Type Description Defined By
$behaviors yii\base\Behavior[] List of behaviors attached to this component. yii\base\Component
$categories array List of message categories that this target is interested in. yii\log\Target
$enabled boolean Indicates whether this log target is enabled. yii\log\Target
$except array List of message categories that this target is NOT interested in. yii\log\Target
$exportInterval integer How many messages should be accumulated before they are exported. yii\log\Target
$levels integer The message levels that this target is interested in. yii\log\Target
$logVars array List of the PHP predefined variables that should be logged in a message. yii\log\Target
$maskVars array List of the PHP predefined variables that should NOT be logged "as is" and should always be replaced with a mask *** before logging, when exist. yii\log\Target
$messages array The messages that are retrieved from the logger so far by this log target. yii\log\Target
$microtime boolean Whether to log time with microseconds. yii\log\Target
$prefix callable|null A PHP callable that returns a string to be prefixed to every exported message. yii\log\Target

Public Methods

Hide inherited methods

Method Description Defined By
__call() Calls the named method which is not a class method. yii\base\Component
__clone() This method is called after the object is created by cloning an existing one. yii\base\Component
__construct() Constructor. yii\base\BaseObject
__get() Returns the value of a component property. yii\base\Component
__isset() Checks if a property is set, i.e. defined and not null. yii\base\Component
__set() Sets the value of a component property. yii\base\Component
__unset() Sets a component property to be null. yii\base\Component
attachBehavior() Attaches a behavior to this component. yii\base\Component
attachBehaviors() Attaches a list of behaviors to the component. yii\base\Component
behaviors() Returns a list of behaviors that this component should behave as. yii\base\Component
canGetProperty() Returns a value indicating whether a property can be read. yii\base\Component
canSetProperty() Returns a value indicating whether a property can be set. yii\base\Component
className() Returns the fully qualified name of this class. yii\base\BaseObject
collect() Processes the given log messages. yii\log\Target
detachBehavior() Detaches a behavior from the component. yii\base\Component
detachBehaviors() Detaches all behaviors from the component. yii\base\Component
ensureBehaviors() Makes sure that the behaviors declared in behaviors() are attached to this component. yii\base\Component
export() Exports log $messages to a specific destination. yii\log\Target
filterMessages() Filters the given messages according to their categories and levels. yii\log\Target
formatMessage() Formats a log message for display as a string. yii\log\Target
getBehavior() Returns the named behavior object. yii\base\Component
getBehaviors() Returns all behaviors attached to this component. yii\base\Component
getEnabled() Check whether the log target is enabled. yii\log\Target
getLevels() yii\log\Target
getMessagePrefix() Returns a string to be prefixed to the given message. yii\log\Target
hasEventHandlers() Returns a value indicating whether there is any handler attached to the named event. yii\base\Component
hasMethod() Returns a value indicating whether a method is defined. yii\base\Component
hasProperty() Returns a value indicating whether a property is defined for this component. yii\base\Component
init() Initializes the object. yii\base\BaseObject
off() Detaches an existing event handler from this component. yii\base\Component
on() Attaches an event handler to an event. yii\base\Component
setEnabled() Sets a value indicating whether this log target is enabled. yii\log\Target
setLevels() Sets the message levels that this target is interested in. yii\log\Target
trigger() Triggers an event. yii\base\Component

Protected Methods

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Method Description Defined By
getContextMessage() Generates the context information to be logged. yii\log\Target
getTime() Returns formatted ('Y-m-d H:i:s') timestamp for message. yii\log\Target

Property Details

Hide inherited properties

$categories public property

List of message categories that this target is interested in. Defaults to empty, meaning all categories. You can use an asterisk at the end of a category so that the category may be used to match those categories sharing the same common prefix. For example, 'yii\db*' will match categories starting with 'yii\db\', such as 'yii\db\Connection'.

public array $categories = []
$enabled public property

Indicates whether this log target is enabled. Defaults to true. Note that the type of this property differs in getter and setter. See getEnabled() and setEnabled() for details.

public boolean $enabled null
$except public property

List of message categories that this target is NOT interested in. Defaults to empty, meaning no uninteresting messages. If this property is not empty, then any category listed here will be excluded from $categories. You can use an asterisk at the end of a category so that the category can be used to match those categories sharing the same common prefix. For example, 'yii\db*' will match categories starting with 'yii\db\', such as 'yii\db\Connection'.

See also $categories.

public array $except = []
$exportInterval public property

How many messages should be accumulated before they are exported. Defaults to 1000. Note that messages will always be exported when the application terminates. Set this property to be 0 if you don't want to export messages until the application terminates.

public integer $exportInterval 1000
$levels public property

The message levels that this target is interested in. This is a bitmap of level values. Defaults to 0, meaning all available levels. Note that the type of this property differs in getter and setter. See getLevels() and setLevels() for details.

For more details and usage information on Target, see the guide article on logging & targets.

public integer $levels null
$logVars public property

List of the PHP predefined variables that should be logged in a message. Note that a variable must be accessible via $GLOBALS. Otherwise it won't be logged.

Defaults to ['_GET', '_POST', '_FILES', '_COOKIE', '_SESSION', '_SERVER'].

Since version 2.0.9 additional syntax can be used: Each element could be specified as one of the following:

  • var - var will be logged.
  • var.key - only var[key] key will be logged.
  • !var.key - var[key] key will be excluded.

Note that if you need $_SESSION to logged regardless if session was used you have to open it right at the start of your request.

See also yii\helpers\ArrayHelper::filter().

public array $logVars = [
    
'_GET',
    
'_POST',
    
'_FILES',
    
'_COOKIE',
    
'_SESSION',
    
'_SERVER',
]
$maskVars public property (available since version 2.0.16)

List of the PHP predefined variables that should NOT be logged "as is" and should always be replaced with a mask *** before logging, when exist.

Defaults to [ '_SERVER.HTTP_AUTHORIZATION', '_SERVER.PHP_AUTH_USER', '_SERVER.PHP_AUTH_PW']

Each element could be specified as one of the following:

  • var - var will be logged as ***
  • var.key - only var[key] will be logged as ***
public array $maskVars = [
    
'_SERVER.HTTP_AUTHORIZATION',
    
'_SERVER.PHP_AUTH_USER',
    
'_SERVER.PHP_AUTH_PW',
]
$messages public property

The messages that are retrieved from the logger so far by this log target. Please refer to yii\log\Logger::$messages for the details about the message structure.

public array $messages = []
$microtime public property (available since version 2.0.13)

Whether to log time with microseconds. Defaults to false.

public boolean $microtime false
$prefix public property

A PHP callable that returns a string to be prefixed to every exported message.

If not set, getMessagePrefix() will be used, which prefixes the message with context information such as user IP, user ID and session ID.

The signature of the callable should be function ($message).

public callable|null $prefix null

Method Details

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__call() public method

Defined in: yii\base\Component::__call()

Calls the named method which is not a class method.

This method will check if any attached behavior has the named method and will execute it if available.

Do not call this method directly as it is a PHP magic method that will be implicitly called when an unknown method is being invoked.

public mixed __call ( $name, $params )
$name string

The method name

$params array

Method parameters

return mixed

The method return value

throws yii\base\UnknownMethodException

when calling unknown method

                public function __call($name, $params)
{
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $object) {
        if ($object->hasMethod($name)) {
            return call_user_func_array([$object, $name], $params);
        }
    }
    throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
}

            
__clone() public method

Defined in: yii\base\Component::__clone()

This method is called after the object is created by cloning an existing one.

It removes all behaviors because they are attached to the old object.

public void __clone ( )

                public function __clone()
{
    $this->_events = [];
    $this->_eventWildcards = [];
    $this->_behaviors = null;
}

            
__construct() public method

Defined in: yii\base\BaseObject::__construct()

Constructor.

The default implementation does two things:

  • Initializes the object with the given configuration $config.
  • Call init().

If this method is overridden in a child class, it is recommended that

  • the last parameter of the constructor is a configuration array, like $config here.
  • call the parent implementation at the end of the constructor.
public void __construct ( $config = [] )
$config array

Name-value pairs that will be used to initialize the object properties

                public function __construct($config = [])
{
    if (!empty($config)) {
        Yii::configure($this, $config);
    }
    $this->init();
}

            
__get() public method

Defined in: yii\base\Component::__get()

Returns the value of a component property.

This method will check in the following order and act accordingly:

  • a property defined by a getter: return the getter result
  • a property of a behavior: return the behavior property value

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $value = $component->property;.

See also __set().

public mixed __get ( $name )
$name string

The property name

return mixed

The property value or the value of a behavior's property

throws yii\base\UnknownPropertyException

if the property is not defined

throws yii\base\InvalidCallException

if the property is write-only.

                public function __get($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        // read property, e.g. getName()
        return $this->$getter();
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canGetProperty($name)) {
            return $behavior->$name;
        }
    }
    if (method_exists($this, 'set' . $name)) {
        throw new InvalidCallException('Getting write-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Getting unknown property: ' . get_class($this) . '::' . $name);
}

            
__isset() public method

Defined in: yii\base\Component::__isset()

Checks if a property is set, i.e. defined and not null.

This method will check in the following order and act accordingly:

  • a property defined by a setter: return whether the property is set
  • a property of a behavior: return whether the property is set
  • return false for non existing properties

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing isset($component->property).

See also https://www.php.net/manual/en/function.isset.php.

public boolean __isset ( $name )
$name string

The property name or the event name

return boolean

Whether the named property is set

                public function __isset($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter() !== null;
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canGetProperty($name)) {
            return $behavior->$name !== null;
        }
    }
    return false;
}

            
__set() public method

Defined in: yii\base\Component::__set()

Sets the value of a component property.

This method will check in the following order and act accordingly:

  • a property defined by a setter: set the property value
  • an event in the format of "on xyz": attach the handler to the event "xyz"
  • a behavior in the format of "as xyz": attach the behavior named as "xyz"
  • a property of a behavior: set the behavior property value

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $component->property = $value;.

See also __get().

public void __set ( $name, $value )
$name string

The property name or the event name

$value mixed

The property value

throws yii\base\UnknownPropertyException

if the property is not defined

throws yii\base\InvalidCallException

if the property is read-only.

                public function __set($name, $value)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        // set property
        $this->$setter($value);
        return;
    } elseif (strncmp($name, 'on ', 3) === 0) {
        // on event: attach event handler
        $this->on(trim(substr($name, 3)), $value);
        return;
    } elseif (strncmp($name, 'as ', 3) === 0) {
        // as behavior: attach behavior
        $name = trim(substr($name, 3));
        $this->attachBehavior($name, $value instanceof Behavior ? $value : Yii::createObject($value));
        return;
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = $value;
            return;
        }
    }
    if (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
}

            
__unset() public method

Defined in: yii\base\Component::__unset()

Sets a component property to be null.

This method will check in the following order and act accordingly:

  • a property defined by a setter: set the property value to be null
  • a property of a behavior: set the property value to be null

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing unset($component->property).

See also https://www.php.net/manual/en/function.unset.php.

public void __unset ( $name )
$name string

The property name

throws yii\base\InvalidCallException

if the property is read only.

                public function __unset($name)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter(null);
        return;
    }
    // behavior property
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = null;
            return;
        }
    }
    throw new InvalidCallException('Unsetting an unknown or read-only property: ' . get_class($this) . '::' . $name);
}

            
attachBehavior() public method

Defined in: yii\base\Component::attachBehavior()

Attaches a behavior to this component.

This method will create the behavior object based on the given configuration. After that, the behavior object will be attached to this component by calling the yii\base\Behavior::attach() method.

See also detachBehavior().

public yii\base\Behavior attachBehavior ( $name, $behavior )
$name string

The name of the behavior.

$behavior string|array|yii\base\Behavior

The behavior configuration. This can be one of the following:

return yii\base\Behavior

The behavior object

                public function attachBehavior($name, $behavior)
{
    $this->ensureBehaviors();
    return $this->attachBehaviorInternal($name, $behavior);
}

            
attachBehaviors() public method

Defined in: yii\base\Component::attachBehaviors()

Attaches a list of behaviors to the component.

Each behavior is indexed by its name and should be a yii\base\Behavior object, a string specifying the behavior class, or an configuration array for creating the behavior.

See also attachBehavior().

public void attachBehaviors ( $behaviors )
$behaviors array

List of behaviors to be attached to the component

                public function attachBehaviors($behaviors)
{
    $this->ensureBehaviors();
    foreach ($behaviors as $name => $behavior) {
        $this->attachBehaviorInternal($name, $behavior);
    }
}

            
behaviors() public method

Defined in: yii\base\Component::behaviors()

Returns a list of behaviors that this component should behave as.

Child classes may override this method to specify the behaviors they want to behave as.

The return value of this method should be an array of behavior objects or configurations indexed by behavior names. A behavior configuration can be either a string specifying the behavior class or an array of the following structure:

'behaviorName' => [
    'class' => 'BehaviorClass',
    'property1' => 'value1',
    'property2' => 'value2',
]

Note that a behavior class must extend from yii\base\Behavior. Behaviors can be attached using a name or anonymously. When a name is used as the array key, using this name, the behavior can later be retrieved using getBehavior() or be detached using detachBehavior(). Anonymous behaviors can not be retrieved or detached.

Behaviors declared in this method will be attached to the component automatically (on demand).

public array behaviors ( )
return array

The behavior configurations.

                public function behaviors()
{
    return [];
}

            
canGetProperty() public method

Defined in: yii\base\Component::canGetProperty()

Returns a value indicating whether a property can be read.

A property can be read if:

  • the class has a getter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);
  • an attached behavior has a readable property of the given name (when $checkBehaviors is true).

See also canSetProperty().

public boolean canGetProperty ( $name, $checkVars true, $checkBehaviors true )
$name string

The property name

$checkVars boolean

Whether to treat member variables as properties

$checkBehaviors boolean

Whether to treat behaviors' properties as properties of this component

return boolean

Whether the property can be read

                public function canGetProperty($name, $checkVars = true, $checkBehaviors = true)
{
    if (method_exists($this, 'get' . $name) || $checkVars && property_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->canGetProperty($name, $checkVars)) {
                return true;
            }
        }
    }
    return false;
}

            
canSetProperty() public method

Defined in: yii\base\Component::canSetProperty()

Returns a value indicating whether a property can be set.

A property can be written if:

  • the class has a setter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);
  • an attached behavior has a writable property of the given name (when $checkBehaviors is true).

See also canGetProperty().

public boolean canSetProperty ( $name, $checkVars true, $checkBehaviors true )
$name string

The property name

$checkVars boolean

Whether to treat member variables as properties

$checkBehaviors boolean

Whether to treat behaviors' properties as properties of this component

return boolean

Whether the property can be written

                public function canSetProperty($name, $checkVars = true, $checkBehaviors = true)
{
    if (method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->canSetProperty($name, $checkVars)) {
                return true;
            }
        }
    }
    return false;
}

            
className() public static method
Deprecated since 2.0.14. On PHP >=5.5, use ::class instead.

Defined in: yii\base\BaseObject::className()

Returns the fully qualified name of this class.

public static string className ( )
return string

The fully qualified name of this class.

                public static function className()
{
    return get_called_class();
}

            
collect() public method

Processes the given log messages.

This method will filter the given messages with $levels and $categories. And if requested, it will also export the filtering result to specific medium (e.g. email).

public void collect ( $messages, $final )
$messages array

Log messages to be processed. See yii\log\Logger::$messages for the structure of each message.

$final boolean

Whether this method is called at the end of the current application

                public function collect($messages, $final)
{
    $this->messages = array_merge($this->messages, static::filterMessages($messages, $this->getLevels(), $this->categories, $this->except));
    $count = count($this->messages);
    if ($count > 0 && ($final || $this->exportInterval > 0 && $count >= $this->exportInterval)) {
        if (($context = $this->getContextMessage()) !== '') {
            $this->messages[] = [$context, Logger::LEVEL_INFO, 'application', YII_BEGIN_TIME, [], 0];
        }
        // set exportInterval to 0 to avoid triggering export again while exporting
        $oldExportInterval = $this->exportInterval;
        $this->exportInterval = 0;
        $this->export();
        $this->exportInterval = $oldExportInterval;
        $this->messages = [];
    }
}

            
detachBehavior() public method

Defined in: yii\base\Component::detachBehavior()

Detaches a behavior from the component.

The behavior's yii\base\Behavior::detach() method will be invoked.

public yii\base\Behavior|null detachBehavior ( $name )
$name string

The behavior's name.

return yii\base\Behavior|null

The detached behavior. Null if the behavior does not exist.

                public function detachBehavior($name)
{
    $this->ensureBehaviors();
    if (isset($this->_behaviors[$name])) {
        $behavior = $this->_behaviors[$name];
        unset($this->_behaviors[$name]);
        $behavior->detach();
        return $behavior;
    }
    return null;
}

            
detachBehaviors() public method

Defined in: yii\base\Component::detachBehaviors()

Detaches all behaviors from the component.

public void detachBehaviors ( )

                public function detachBehaviors()
{
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $name => $behavior) {
        $this->detachBehavior($name);
    }
}

            
ensureBehaviors() public method

Defined in: yii\base\Component::ensureBehaviors()

Makes sure that the behaviors declared in behaviors() are attached to this component.

public void ensureBehaviors ( )

                public function ensureBehaviors()
{
    if ($this->_behaviors === null) {
        $this->_behaviors = [];
        foreach ($this->behaviors() as $name => $behavior) {
            $this->attachBehaviorInternal($name, $behavior);
        }
    }
}

            
export() public abstract method

Exports log $messages to a specific destination.

Child classes must implement this method.

public abstract void export ( )

                abstract public function export();

            
filterMessages() public static method

Filters the given messages according to their categories and levels.

public static array filterMessages ( $messages, $levels 0, $categories = [], $except = [] )
$messages array

Messages to be filtered. The message structure follows that in yii\log\Logger::$messages.

$levels integer

The message levels to filter by. This is a bitmap of level values. Value 0 means allowing all levels.

$categories array

The message categories to filter by. If empty, it means all categories are allowed.

$except array

The message categories to exclude. If empty, it means all categories are allowed.

return array

The filtered messages.

                public static function filterMessages($messages, $levels = 0, $categories = [], $except = [])
{
    foreach ($messages as $i => $message) {
        if ($levels && !($levels & $message[1])) {
            unset($messages[$i]);
            continue;
        }
        $matched = empty($categories);
        foreach ($categories as $category) {
            if ($message[2] === $category || !empty($category) && substr_compare($category, '*', -1, 1) === 0 && strpos($message[2], rtrim($category, '*')) === 0) {
                $matched = true;
                break;
            }
        }
        if ($matched) {
            foreach ($except as $category) {
                $prefix = rtrim($category, '*');
                if (($message[2] === $category || $prefix !== $category) && strpos($message[2], $prefix) === 0) {
                    $matched = false;
                    break;
                }
            }
        }
        if (!$matched) {
            unset($messages[$i]);
        }
    }
    return $messages;
}

            
formatMessage() public method

Formats a log message for display as a string.

public string formatMessage ( $message )
$message array

The log message to be formatted. The message structure follows that in yii\log\Logger::$messages.

return string

The formatted message

                public function formatMessage($message)
{
    list($text, $level, $category, $timestamp) = $message;
    $level = Logger::getLevelName($level);
    if (!is_string($text)) {
        // exceptions may not be serializable if in the call stack somewhere is a Closure
        if ($text instanceof \Exception || $text instanceof \Throwable) {
            $text = (string) $text;
        } else {
            $text = VarDumper::export($text);
        }
    }
    $traces = [];
    if (isset($message[4])) {
        foreach ($message[4] as $trace) {
            $traces[] = "in {$trace['file']}:{$trace['line']}";
        }
    }
    $prefix = $this->getMessagePrefix($message);
    return $this->getTime($timestamp) . " {$prefix}[$level][$category] $text"
        . (empty($traces) ? '' : "\n    " . implode("\n    ", $traces));
}

            
getBehavior() public method

Defined in: yii\base\Component::getBehavior()

Returns the named behavior object.

public yii\base\Behavior|null getBehavior ( $name )
$name string

The behavior name

return yii\base\Behavior|null

The behavior object, or null if the behavior does not exist

                public function getBehavior($name)
{
    $this->ensureBehaviors();
    return isset($this->_behaviors[$name]) ? $this->_behaviors[$name] : null;
}

            
getBehaviors() public method

Defined in: yii\base\Component::getBehaviors()

Returns all behaviors attached to this component.

public yii\base\Behavior[] getBehaviors ( )
return yii\base\Behavior[]

List of behaviors attached to this component

                public function getBehaviors()
{
    $this->ensureBehaviors();
    return $this->_behaviors;
}

            
getContextMessage() protected method

Generates the context information to be logged.

The default implementation will dump user information, system variables, etc.

protected string getContextMessage ( )
return string

The context information. If an empty string, it means no context information.

                protected function getContextMessage()
{
    $context = ArrayHelper::filter($GLOBALS, $this->logVars);
    foreach ($this->maskVars as $var) {
        if (ArrayHelper::getValue($context, $var) !== null) {
            ArrayHelper::setValue($context, $var, '***');
        }
    }
    $result = [];
    foreach ($context as $key => $value) {
        $result[] = "\${$key} = " . VarDumper::dumpAsString($value);
    }
    return implode("\n\n", $result);
}

            
getEnabled() public method

Check whether the log target is enabled.

public boolean getEnabled ( )
return boolean

A value indicating whether this log target is enabled.

                public function getEnabled()
{
    if (is_callable($this->_enabled)) {
        return call_user_func($this->_enabled, $this);
    }
    return $this->_enabled;
}

            
getLevels() public method

public integer getLevels ( )
return integer

The message levels that this target is interested in. This is a bitmap of level values. Defaults to 0, meaning all available levels.

                public function getLevels()
{
    return $this->_levels;
}

            
getMessagePrefix() public method

Returns a string to be prefixed to the given message.

If $prefix is configured it will return the result of the callback. The default implementation will return user IP, user ID and session ID as a prefix.

public string getMessagePrefix ( $message )
$message array

The message being exported. The message structure follows that in yii\log\Logger::$messages.

return string

The prefix string

                public function getMessagePrefix($message)
{
    if ($this->prefix !== null) {
        return call_user_func($this->prefix, $message);
    }
    if (Yii::$app === null) {
        return '';
    }
    $request = Yii::$app->getRequest();
    $ip = $request instanceof Request ? $request->getUserIP() : '-';
    /* @var $user \yii\web\User */
    $user = Yii::$app->has('user', true) ? Yii::$app->get('user') : null;
    if ($user && ($identity = $user->getIdentity(false))) {
        $userID = $identity->getId();
    } else {
        $userID = '-';
    }
    /* @var $session \yii\web\Session */
    $session = Yii::$app->has('session', true) ? Yii::$app->get('session') : null;
    $sessionID = $session && $session->getIsActive() ? $session->getId() : '-';
    return "[$ip][$userID][$sessionID]";
}

            
getTime() protected method (available since version 2.0.13)

Returns formatted ('Y-m-d H:i:s') timestamp for message.

If $microtime is configured to true it will return format 'Y-m-d H:i:s.u'.

protected string getTime ( $timestamp )
$timestamp float

                protected function getTime($timestamp)
{
    $parts = explode('.', sprintf('%F', $timestamp));
    return date('Y-m-d H:i:s', $parts[0]) . ($this->microtime ? ('.' . $parts[1]) : '');
}

            
hasEventHandlers() public method

Defined in: yii\base\Component::hasEventHandlers()

Returns a value indicating whether there is any handler attached to the named event.

public boolean hasEventHandlers ( $name )
$name string

The event name

return boolean

Whether there is any handler attached to the event.

                public function hasEventHandlers($name)
{
    $this->ensureBehaviors();
    if (!empty($this->_events[$name])) {
        return true;
    }
    foreach ($this->_eventWildcards as $wildcard => $handlers) {
        if (!empty($handlers) && StringHelper::matchWildcard($wildcard, $name)) {
            return true;
        }
    }
    return Event::hasHandlers($this, $name);
}

            
hasMethod() public method

Defined in: yii\base\Component::hasMethod()

Returns a value indicating whether a method is defined.

A method is defined if:

  • the class has a method with the specified name
  • an attached behavior has a method with the given name (when $checkBehaviors is true).
public boolean hasMethod ( $name, $checkBehaviors true )
$name string

The property name

$checkBehaviors boolean

Whether to treat behaviors' methods as methods of this component

return boolean

Whether the method is defined

                public function hasMethod($name, $checkBehaviors = true)
{
    if (method_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->hasMethod($name)) {
                return true;
            }
        }
    }
    return false;
}

            
hasProperty() public method

Defined in: yii\base\Component::hasProperty()

Returns a value indicating whether a property is defined for this component.

A property is defined if:

  • the class has a getter or setter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);
  • an attached behavior has a property of the given name (when $checkBehaviors is true).

See also:

public boolean hasProperty ( $name, $checkVars true, $checkBehaviors true )
$name string

The property name

$checkVars boolean

Whether to treat member variables as properties

$checkBehaviors boolean

Whether to treat behaviors' properties as properties of this component

return boolean

Whether the property is defined

                public function hasProperty($name, $checkVars = true, $checkBehaviors = true)
{
    return $this->canGetProperty($name, $checkVars, $checkBehaviors) || $this->canSetProperty($name, false, $checkBehaviors);
}

            
init() public method

Defined in: yii\base\BaseObject::init()

Initializes the object.

This method is invoked at the end of the constructor after the object is initialized with the given configuration.

public void init ( )

                public function init()
{
}

            
off() public method

Defined in: yii\base\Component::off()

Detaches an existing event handler from this component.

This method is the opposite of on().

Note: in case wildcard pattern is passed for event name, only the handlers registered with this wildcard will be removed, while handlers registered with plain names matching this wildcard will remain.

See also on().

public boolean off ( $name, $handler null )
$name string

Event name

$handler callable|null

The event handler to be removed. If it is null, all handlers attached to the named event will be removed.

return boolean

If a handler is found and detached

                public function off($name, $handler = null)
{
    $this->ensureBehaviors();
    if (empty($this->_events[$name]) && empty($this->_eventWildcards[$name])) {
        return false;
    }
    if ($handler === null) {
        unset($this->_events[$name], $this->_eventWildcards[$name]);
        return true;
    }
    $removed = false;
    // plain event names
    if (isset($this->_events[$name])) {
        foreach ($this->_events[$name] as $i => $event) {
            if ($event[0] === $handler) {
                unset($this->_events[$name][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            $this->_events[$name] = array_values($this->_events[$name]);
            return true;
        }
    }
    // wildcard event names
    if (isset($this->_eventWildcards[$name])) {
        foreach ($this->_eventWildcards[$name] as $i => $event) {
            if ($event[0] === $handler) {
                unset($this->_eventWildcards[$name][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            $this->_eventWildcards[$name] = array_values($this->_eventWildcards[$name]);
            // remove empty wildcards to save future redundant regex checks:
            if (empty($this->_eventWildcards[$name])) {
                unset($this->_eventWildcards[$name]);
            }
        }
    }
    return $removed;
}

            
on() public method

Defined in: yii\base\Component::on()

Attaches an event handler to an event.

The event handler must be a valid PHP callback. The following are some examples:

function ($event) { ... }         // anonymous function
[$object, 'handleClick']          // $object->handleClick()
['Page', 'handleClick']           // Page::handleClick()
'handleClick'                     // global function handleClick()

The event handler must be defined with the following signature,

function ($event)

where $event is an yii\base\Event object which includes parameters associated with the event.

Since 2.0.14 you can specify event name as a wildcard pattern:

$component->on('event.group.*', function ($event) {
    Yii::trace($event->name . ' is triggered.');
});

See also off().

public void on ( $name, $handler, $data null, $append true )
$name string

The event name

$handler callable

The event handler

$data mixed

The data to be passed to the event handler when the event is triggered. When the event handler is invoked, this data can be accessed via yii\base\Event::$data.

$append boolean

Whether to append new event handler to the end of the existing handler list. If false, the new handler will be inserted at the beginning of the existing handler list.

                public function on($name, $handler, $data = null, $append = true)
{
    $this->ensureBehaviors();
    if (strpos($name, '*') !== false) {
        if ($append || empty($this->_eventWildcards[$name])) {
            $this->_eventWildcards[$name][] = [$handler, $data];
        } else {
            array_unshift($this->_eventWildcards[$name], [$handler, $data]);
        }
        return;
    }
    if ($append || empty($this->_events[$name])) {
        $this->_events[$name][] = [$handler, $data];
    } else {
        array_unshift($this->_events[$name], [$handler, $data]);
    }
}

            
setEnabled() public method

Sets a value indicating whether this log target is enabled.

public void setEnabled ( $value )
$value boolean|callable

A boolean value or a callable to obtain the value from. The callable value is available since version 2.0.13.

A callable may be used to determine whether the log target should be enabled in a dynamic way. For example, to only enable a log if the current user is logged in you can configure the target as follows:

'enabled' => function() {
    return !Yii::$app->user->isGuest;
}

                public function setEnabled($value)
{
    $this->_enabled = $value;
}

            
setLevels() public method

Sets the message levels that this target is interested in.

The parameter can be either an array of interested level names or an integer representing the bitmap of the interested level values. Valid level names include: 'error', 'warning', 'info', 'trace' and 'profile'; valid level values include: yii\log\Logger::LEVEL_ERROR, yii\log\Logger::LEVEL_WARNING, yii\log\Logger::LEVEL_INFO, yii\log\Logger::LEVEL_TRACE and yii\log\Logger::LEVEL_PROFILE.

For example,

['error', 'warning']
// which is equivalent to:
Logger::LEVEL_ERROR | Logger::LEVEL_WARNING
public void setLevels ( $levels )
$levels array|integer

Message levels that this target is interested in.

throws yii\base\InvalidConfigException

if $levels value is not correct.

                public function setLevels($levels)
{
    static $levelMap = [
        'error' => Logger::LEVEL_ERROR,
        'warning' => Logger::LEVEL_WARNING,
        'info' => Logger::LEVEL_INFO,
        'trace' => Logger::LEVEL_TRACE,
        'profile' => Logger::LEVEL_PROFILE,
    ];
    if (is_array($levels)) {
        $this->_levels = 0;
        foreach ($levels as $level) {
            if (isset($levelMap[$level])) {
                $this->_levels |= $levelMap[$level];
            } else {
                throw new InvalidConfigException("Unrecognized level: $level");
            }
        }
    } else {
        $bitmapValues = array_reduce($levelMap, function ($carry, $item) {
            return $carry | $item;
        });
        if (!($bitmapValues & $levels) && $levels !== 0) {
            throw new InvalidConfigException("Incorrect $levels value");
        }
        $this->_levels = $levels;
    }
}

            
trigger() public method

Defined in: yii\base\Component::trigger()

Triggers an event.

This method represents the happening of an event. It invokes all attached handlers for the event including class-level handlers.

public void trigger ( $name, yii\base\Event $event null )
$name string

The event name

$event yii\base\Event|null

The event instance. If not set, a default yii\base\Event object will be created.

                public function trigger($name, Event $event = null)
{
    $this->ensureBehaviors();
    $eventHandlers = [];
    foreach ($this->_eventWildcards as $wildcard => $handlers) {
        if (StringHelper::matchWildcard($wildcard, $name)) {
            $eventHandlers[] = $handlers;
        }
    }
    if (!empty($this->_events[$name])) {
        $eventHandlers[] = $this->_events[$name];
    }
    if (!empty($eventHandlers)) {
        $eventHandlers = call_user_func_array('array_merge', $eventHandlers);
        if ($event === null) {
            $event = new Event();
        }
        if ($event->sender === null) {
            $event->sender = $this;
        }
        $event->handled = false;
        $event->name = $name;
        foreach ($eventHandlers as $handler) {
            $event->data = $handler[1];
            call_user_func($handler[0], $event);
            // stop further handling if the event is handled
            if ($event->handled) {
                return;
            }
        }
    }
    // invoke class-level attached handlers
    Event::trigger($this, $name, $event);
}