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Showing content from https://www.yiiframework.com/doc/api/2.0/yii-web-errorhandler below:

ErrorHandler, yii\web\ErrorHandler | API Documentation for Yii 2.0

Class yii\web\ErrorHandler

ErrorHandler handles uncaught PHP errors and exceptions.

ErrorHandler displays these errors using appropriate views based on the nature of the errors and the mode the application runs at.

ErrorHandler is configured as an application component in yii\base\Application by default. You can access that instance via Yii::$app->errorHandler.

For more details and usage information on ErrorHandler, see the guide article on handling errors.

Property Details

Hide inherited properties

The path of the view file for rendering exceptions and errors call stack element.

List of the PHP predefined variables that should be displayed on the error page. Note that a variable must be accessible via $GLOBALS. Otherwise it won't be displayed. Defaults to ['_GET', '_POST', '_FILES', '_COOKIE', '_SESSION'].

See also renderRequest().

The route (e.g. site/error) to the controller action that will be used to display external errors. Inside the action, it can retrieve the error information using Yii::$app->errorHandler->exception. This property defaults to null, meaning ErrorHandler will handle the error display.

The path of the view file for rendering exceptions without call stack information.

The path of the view file for rendering exceptions.

Maximum number of source code lines to be displayed. Defaults to 19.

Maximum number of trace source code lines to be displayed. Defaults to 13.

The path of the view file for rendering previous exceptions.

Method Details

Hide inherited methods

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 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()");
}

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

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();
}

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 function __get($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        
        return $this->$getter();
    }
    
    $this->ensureBehaviors();
    foreach ($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);
}

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

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 function __set($name, $value)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        
        $this->$setter($value);
        return;
    } elseif (strncmp($name, 'on ', 3) === 0) {
        
        $this->on(trim(substr($name, 3)), $value);
        return;
    } elseif (strncmp($name, 'as ', 3) === 0) {
        
        $name = trim(substr($name, 3));
        if ($value instanceof Behavior) {
            $this->attachBehavior($name, $value);
        } elseif ($value instanceof \Closure) {
            $this->attachBehavior($name, call_user_func($value));
        } elseif (isset($value['__class']) && is_subclass_of($value['__class'], Behavior::class)) {
            $this->attachBehavior($name, Yii::createObject($value));
        } elseif (!isset($value['__class']) && isset($value['class']) && is_subclass_of($value['class'], Behavior::class)) {
            $this->attachBehavior($name, Yii::createObject($value));
        } elseif (is_string($value) && is_subclass_of($value, Behavior::class, true)) {
            $this->attachBehavior($name, Yii::createObject($value));
        } else {
            throw new InvalidConfigException('Class is not of type ' . Behavior::class . ' or its subclasses');
        }
        return;
    }
    
    $this->ensureBehaviors();
    foreach ($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);
}

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 function __unset($name)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter(null);
        return;
    }
    
    $this->ensureBehaviors();
    foreach ($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);
}

Adds informational links to the given PHP type/class.

                public function addTypeLinks($code)
{
    if (preg_match('/(.*?)::([^(]+)/', $code, $matches)) {
        $class = $matches[1];
        $method = $matches[2];
        $text = $this->htmlEncode($class) . '::' . $this->htmlEncode($method);
    } else {
        $class = $code;
        $method = null;
        $text = $this->htmlEncode($class);
    }
    $url = null;
    $shouldGenerateLink = true;
    if ($method !== null && strpos($method, '{closure') === false) {
        $reflection = new \ReflectionClass($class);
        if ($reflection->hasMethod($method)) {
            $reflectionMethod = $reflection->getMethod($method);
            $shouldGenerateLink = $reflectionMethod->isPublic() || $reflectionMethod->isProtected();
        } else {
            $shouldGenerateLink = false;
        }
    }
    if ($shouldGenerateLink) {
        $url = $this->getTypeUrl($class, $method);
    }
    if ($url === null) {
        return $text;
    }
    return '<a href="' . $url . '" target="_blank">' . $text . '</a>';
}

Converts arguments array to its string representation.

                public function argumentsToString($args)
{
    $count = 0;
    $isAssoc = $args !== array_values($args);
    foreach ($args as $key => $value) {
        $count++;
        if ($count >= 5) {
            if ($count > 5) {
                unset($args[$key]);
            } else {
                $args[$key] = '...';
            }
            continue;
        }
        if (is_object($value)) {
            $args[$key] = '<span class="title">' . $this->htmlEncode(get_class($value)) . '</span>';
        } elseif (is_bool($value)) {
            $args[$key] = '<span class="keyword">' . ($value ? 'true' : 'false') . '</span>';
        } elseif (is_string($value)) {
            $fullValue = $this->htmlEncode($value);
            if (mb_strlen($value, 'UTF-8') > 32) {
                $displayValue = $this->htmlEncode(mb_substr($value, 0, 32, 'UTF-8')) . '...';
                $args[$key] = "<span class=\"string\" title=\"$fullValue\">'$displayValue'</span>";
            } else {
                $args[$key] = "<span class=\"string\">'$fullValue'</span>";
            }
        } elseif (is_array($value)) {
            $args[$key] = '[' . $this->argumentsToString($value) . ']';
        } elseif ($value === null) {
            $args[$key] = '<span class="keyword">null</span>';
        } elseif (is_resource($value)) {
            $args[$key] = '<span class="keyword">resource</span>';
        } else {
            $args[$key] = '<span class="number">' . $value . '</span>';
        }
        if (is_string($key)) {
            $args[$key] = '<span class="string">\'' . $this->htmlEncode($key) . "'</span> => $args[$key]";
        } elseif ($isAssoc) {
            $args[$key] = "<span class=\"number\">$key</span> => $args[$key]";
        }
    }
    return implode(', ', $args);
}

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

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);
    }
}

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 function behaviors()
{
    return [];
}

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;
}

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;
}

Deprecated since 2.0.14. On PHP >=5.5, use ::class instead.

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

                public function clearOutput()
{
    
    for ($level = ob_get_level(); $level > 0; --$level) {
        if (!@ob_end_clean()) {
            ob_clean();
        }
    }
}

Converts an exception into an array.

                protected function convertExceptionToArray($exception)
{
    if (!YII_DEBUG && !$exception instanceof UserException && !$exception instanceof HttpException) {
        $exception = new HttpException(500, Yii::t('yii', 'An internal server error occurred.'));
    }
    $array = [
        'name' => ($exception instanceof Exception || $exception instanceof ErrorException) ? $exception->getName() : 'Exception',
        'message' => $exception->getMessage(),
        'code' => $exception->getCode(),
    ];
    if ($exception instanceof HttpException) {
        $array['status'] = $exception->statusCode;
    }
    if (YII_DEBUG) {
        $array['type'] = get_class($exception);
        if (!$exception instanceof UserException) {
            $array['file'] = $exception->getFile();
            $array['line'] = $exception->getLine();
            $array['stack-trace'] = explode("\n", $exception->getTraceAsString());
            if ($exception instanceof \yii\db\Exception) {
                $array['error-info'] = $exception->errorInfo;
            }
        }
    }
    if (($prev = $exception->getPrevious()) !== null) {
        $array['previous'] = $this->convertExceptionToArray($prev);
    }
    return $array;
}

Defined in: yii\base\ErrorHandler::convertExceptionToError()

Converts an exception into a PHP error.

This method can be used to convert exceptions inside of methods like __toString() to PHP errors because exceptions cannot be thrown inside of them.

                public static function convertExceptionToError($exception)
{
    trigger_error(static::convertExceptionToString($exception), E_USER_ERROR);
}

                public static function convertExceptionToString($exception)
{
    if ($exception instanceof UserException) {
        return "{$exception->getName()}: {$exception->getMessage()}";
    }
    if (YII_DEBUG) {
        return static::convertExceptionToVerboseString($exception);
    }
    return 'An internal server error occurred.';
}

                public static function convertExceptionToVerboseString($exception)
{
    if ($exception instanceof Exception) {
        $message = "Exception ({$exception->getName()})";
    } elseif ($exception instanceof ErrorException) {
        $message = (string)$exception->getName();
    } else {
        $message = 'Exception';
    }
    $message .= " '" . get_class($exception) . "' with message '{$exception->getMessage()}' \n\nin "
        . $exception->getFile() . ':' . $exception->getLine() . "\n\n"
        . "Stack trace:\n" . $exception->getTraceAsString();
    return $message;
}

Creates string containing HTML link which refers to the page with the current version of the framework and version number text.

                public function createFrameworkVersionLink()
{
    return '<a href="https://github.com/yiisoft/yii2/" target="_blank">' . $this->htmlEncode(Yii::getVersion()) . '</a>';
}

Creates HTML containing link to the page with the information on given HTTP status code.

public string createHttpStatusLink ( $statusCode, $statusDescription ) $statusCode integer

To be used to generate information link.

$statusDescription string

Description to display after the the status code.

return string

Generated HTML with HTTP status code information.

                public function createHttpStatusLink($statusCode, $statusDescription)
{
    return '<a href="https://en.wikipedia.org/wiki/List_of_HTTP_status_codes#' . (int) $statusCode . '" target="_blank">HTTP ' . (int) $statusCode . ' &ndash; ' . $statusDescription . '</a>';
}

Creates string containing HTML link which refers to the home page of determined web-server software and its full name.

                public function createServerInformationLink()
{
    $serverUrls = [
        'https://httpd.apache.org/' => ['apache'],
        'https://nginx.org/' => ['nginx'],
        'https://www.lighttpd.net/' => ['lighttpd'],
        'http://gwan.com/' => ['g-wan', 'gwan'],
        'https://www.iis.net/' => ['iis', 'services'],
        'https://www.php.net/manual/en/features.commandline.webserver.php' => ['development'],
    ];
    if (isset($_SERVER['SERVER_SOFTWARE'])) {
        foreach ($serverUrls as $url => $keywords) {
            foreach ($keywords as $keyword) {
                if (stripos($_SERVER['SERVER_SOFTWARE'], $keyword) !== false) {
                    return '<a href="' . $url . '" target="_blank">' . $this->htmlEncode($_SERVER['SERVER_SOFTWARE']) . '</a>';
                }
            }
        }
    }
    return '';
}

                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;
}

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

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

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

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

Returns human-readable exception name.

                public function getExceptionName($exception)
{
    if ($exception instanceof \yii\base\Exception || $exception instanceof \yii\base\InvalidCallException || $exception instanceof \yii\base\InvalidParamException || $exception instanceof \yii\base\UnknownMethodException) {
        return $exception->getName();
    }
    return null;
}

Returns the informational link URL for a given PHP type/class.

See also addTypeLinks().

                protected function getTypeUrl($class, $method)
{
    if (strncmp($class, 'yii\\', 4) !== 0) {
        return null;
    }
    $page = $this->htmlEncode(strtolower(str_replace('\\', '-', $class)));
    $url = "https://www.yiiframework.com/doc-2.0/$page.html";
    if ($method) {
        $url .= "#$method()-detail";
    }
    return $url;
}

                public function handleError($code, $message, $file, $line)
{
    if (error_reporting() & $code) {
        
        
        if (!class_exists('yii\\base\\ErrorException', false)) {
            require_once __DIR__ . '/ErrorException.php';
        }
        $exception = new ErrorException($message, $code, $code, $file, $line);
        if (PHP_VERSION_ID < 70400) {
            
            $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
            array_shift($trace);
            foreach ($trace as $frame) {
                if ($frame['function'] === '__toString') {
                    $this->handleException($exception);
                    if (defined('HHVM_VERSION')) {
                        flush();
                    }
                    exit(1);
                }
            }
        }
        throw $exception;
    }
    return false;
}

                public function handleException($exception)
{
    if ($exception instanceof ExitException) {
        return;
    }
    $this->exception = $exception;
    
    $this->unregister();
    
    
    if (PHP_SAPI !== 'cli') {
        http_response_code(500);
    }
    try {
        $this->logException($exception);
        if ($this->discardExistingOutput) {
            $this->clearOutput();
        }
        $this->renderException($exception);
        if (!$this->silentExitOnException) {
            \Yii::getLogger()->flush(true);
            if (defined('HHVM_VERSION')) {
                flush();
            }
            exit(1);
        }
    } catch (\Exception $e) {
        
        $this->handleFallbackExceptionMessage($e, $exception);
    } catch (\Throwable $e) {
        
        $this->handleFallbackExceptionMessage($e, $exception);
    }
    $this->exception = null;
}

                protected function handleFallbackExceptionMessage($exception, $previousException)
{
    $msg = "An Error occurred while handling another error:\n";
    $msg .= (string) $exception;
    $msg .= "\nPrevious exception:\n";
    $msg .= (string) $previousException;
    if (YII_DEBUG) {
        if (PHP_SAPI === 'cli') {
            echo $msg . "\n";
        } else {
            echo '<pre>' . htmlspecialchars($msg, ENT_QUOTES, Yii::$app->charset) . '</pre>';
        }
        $msg .= "\n\$_SERVER = " . VarDumper::export($_SERVER);
    } else {
        echo 'An internal server error occurred.';
    }
    error_log($msg);
    if (defined('HHVM_VERSION')) {
        flush();
    }
    exit(1);
}

                public function handleFatalError()
{
    $this->_memoryReserve = null;
    if (!empty($this->_workingDirectory)) {
        
        chdir($this->_workingDirectory);
        
        $this->_workingDirectory = null;
    }
    $error = error_get_last();
    if ($error === null) {
        return;
    }
    
    
    if (!class_exists('yii\\base\\ErrorException', false)) {
        require_once __DIR__ . '/ErrorException.php';
    }
    if (!ErrorException::isFatalError($error)) {
        return;
    }
    if (!empty($this->_hhvmException)) {
        $this->exception = $this->_hhvmException;
    } else {
        $this->exception = new ErrorException(
            $error['message'],
            $error['type'],
            $error['type'],
            $error['file'],
            $error['line']
        );
    }
    unset($error);
    $this->logException($this->exception);
    if ($this->discardExistingOutput) {
        $this->clearOutput();
    }
    $this->renderException($this->exception);
    
    Yii::getLogger()->flush(true);
    if (defined('HHVM_VERSION')) {
        flush();
    }
    $this->trigger(static::EVENT_SHUTDOWN);
    
    register_shutdown_function(function () {
        exit(1);
    });
}

Defined in: yii\base\ErrorHandler::handleHhvmError()

Handles HHVM execution errors such as warnings and notices.

This method is used as a HHVM error handler. It will store exception that will be used in fatal error handler

public boolean handleHhvmError ( $code, $message, $file, $line, $context, $backtrace ) $code integer

The level of the error raised.

$message string

The error message.

$file string

The filename that the error was raised in.

$line integer

The line number the error was raised at.

$context mixed $backtrace mixed

Trace of error

return boolean

Whether the normal error handler continues.

throws yii\base\ErrorException

                public function handleHhvmError($code, $message, $file, $line, $context, $backtrace)
{
    if ($this->handleError($code, $message, $file, $line)) {
        return true;
    }
    if (E_ERROR & $code) {
        $exception = new ErrorException($message, $code, $code, $file, $line);
        $ref = new \ReflectionProperty('\Exception', 'trace');
        $ref->setAccessible(true);
        $ref->setValue($exception, $backtrace);
        $this->_hhvmException = $exception;
    }
    return false;
}

                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);
}

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;
}

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);
}

Converts special characters to HTML entities.

                public function htmlEncode($text)
{
    return htmlspecialchars($text, ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML5, 'UTF-8');
}

                public function init()
{
    $this->silentExitOnException = $this->silentExitOnException !== null ? $this->silentExitOnException : YII_ENV_TEST;
    parent::init();
}

Determines whether given name of the file belongs to the framework.

                public function isCoreFile($file)
{
    return $file === null || strpos(realpath($file), YII2_PATH . DIRECTORY_SEPARATOR) === 0;
}

Version Description 2.0.3 this method is now public.

                public function logException($exception)
{
    $category = get_class($exception);
    if ($exception instanceof HttpException) {
        $category = 'yii\\web\\HttpException:' . $exception->statusCode;
    } elseif ($exception instanceof \ErrorException) {
        $category .= ':' . $exception->getSeverity();
    }
    Yii::error($exception, $category);
}

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;
    
    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;
        }
    }
    
    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]);
            
            if (empty($this->_eventWildcards[$name])) {
                unset($this->_eventWildcards[$name]);
            }
        }
    }
    return $removed;
}

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 ($event) { ... }         
[$object, 'handleClick']          
['Page', 'handleClick']           
'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]);
    }
}

Version Description 2.0.32 this will not do anything if the error handler was already registered

                public function register()
{
    if (!$this->_registered) {
        ini_set('display_errors', false);
        set_exception_handler([$this, 'handleException']);
        if (defined('HHVM_VERSION')) {
            set_error_handler([$this, 'handleHhvmError']);
        } else {
            set_error_handler([$this, 'handleError']);
        }
        if ($this->memoryReserveSize > 0) {
            $this->_memoryReserve = str_repeat('x', $this->memoryReserveSize);
        }
        
        if (PHP_SAPI !== 'cli') {
            $this->_workingDirectory = getcwd();
        }
        register_shutdown_function([$this, 'handleFatalError']);
        $this->_registered = true;
    }
}

Renders call stack.

                public function renderCallStack($exception)
{
    $out = '<ul>';
    $out .= $this->renderCallStackItem($exception->getFile(), $exception->getLine(), null, null, [], 1);
    for ($i = 0, $trace = $exception->getTrace(), $length = count($trace); $i < $length; ++$i) {
        $file = !empty($trace[$i]['file']) ? $trace[$i]['file'] : null;
        $line = !empty($trace[$i]['line']) ? $trace[$i]['line'] : null;
        $class = !empty($trace[$i]['class']) ? $trace[$i]['class'] : null;
        $function = null;
        if (!empty($trace[$i]['function']) && $trace[$i]['function'] !== 'unknown') {
            $function = $trace[$i]['function'];
        }
        $args = !empty($trace[$i]['args']) ? $trace[$i]['args'] : [];
        $out .= $this->renderCallStackItem($file, $line, $class, $function, $args, $i + 2);
    }
    $out .= '</ul>';
    return $out;
}

Renders a single call stack element.

public string renderCallStackItem ( $file, $line, $class, $method, $args, $index ) $file string|null

Name where call has happened.

$line integer|null

Number on which call has happened.

$class string|null

Called class name.

$method string|null

Called function/method name.

$args array

Array of method arguments.

$index integer

Number of the call stack element.

return string

HTML content of the rendered call stack element.

                public function renderCallStackItem($file, $line, $class, $method, $args, $index)
{
    $lines = [];
    $begin = $end = 0;
    if ($file !== null && $line !== null) {
        $line--; 
        $lines = @file($file);
        if ($line < 0 || $lines === false || ($lineCount = count($lines)) < $line) {
            return '';
        }
        $half = (int) (($index === 1 ? $this->maxSourceLines : $this->maxTraceSourceLines) / 2);
        $begin = $line - $half > 0 ? $line - $half : 0;
        $end = $line + $half < $lineCount ? $line + $half : $lineCount - 1;
    }
    return $this->renderFile($this->callStackItemView, [
        'file' => $file,
        'line' => $line,
        'class' => $class,
        'method' => $method,
        'index' => $index,
        'lines' => $lines,
        'begin' => $begin,
        'end' => $end,
        'args' => $args,
    ]);
}

Renders the exception.

                protected function renderException($exception)
{
    if (Yii::$app->has('response')) {
        $response = Yii::$app->getResponse();
        
        
        $response->isSent = false;
        $response->stream = null;
        $response->data = null;
        $response->content = null;
    } else {
        $response = new Response();
    }
    $response->setStatusCodeByException($exception);
    $useErrorView = $response->format === Response::FORMAT_HTML && (!YII_DEBUG || $exception instanceof UserException);
    if ($useErrorView && $this->errorAction !== null) {
        Yii::$app->view->clear();
        $result = Yii::$app->runAction($this->errorAction);
        if ($result instanceof Response) {
            $response = $result;
        } else {
            $response->data = $result;
        }
    } elseif ($response->format === Response::FORMAT_HTML) {
        if ($this->shouldRenderSimpleHtml()) {
            
            $response->data = '<pre>' . $this->htmlEncode(static::convertExceptionToString($exception)) . '</pre>';
        } else {
            
            
            if (YII_DEBUG) {
                ini_set('display_errors', 1);
            }
            $file = $useErrorView ? $this->errorView : $this->exceptionView;
            $response->data = $this->renderFile($file, [
                'exception' => $exception,
            ]);
        }
    } elseif ($response->format === Response::FORMAT_RAW) {
        $response->data = static::convertExceptionToString($exception);
    } else {
        $response->data = $this->convertExceptionToArray($exception);
    }
    $response->send();
}

Renders a view file as a PHP script.

public string renderFile ( $_file_, $_params_ ) $_file_ string

The view file.

$_params_ array

The parameters (name-value pairs) that will be extracted and made available in the view file.

return string

The rendering result

                public function renderFile($_file_, $_params_)
{
    $_params_['handler'] = $this;
    if ($this->exception instanceof ErrorException || !Yii::$app->has('view')) {
        ob_start();
        ob_implicit_flush(false);
        extract($_params_, EXTR_OVERWRITE);
        require Yii::getAlias($_file_);
        return ob_get_clean();
    }
    $view = Yii::$app->getView();
    $view->clear();
    return $view->renderFile($_file_, $_params_, $this);
}

Renders the previous exception stack for a given Exception.

                public function renderPreviousExceptions($exception)
{
    if (($previous = $exception->getPrevious()) !== null) {
        return $this->renderFile($this->previousExceptionView, ['exception' => $previous]);
    }
    return '';
}

Renders the global variables of the request.

List of global variables is defined in $displayVars.

See also $displayVars.

                public function renderRequest()
{
    $request = '';
    foreach ($this->displayVars as $name) {
        if (!empty($GLOBALS[$name])) {
            $request .= '$' . $name . ' = ' . VarDumper::export($GLOBALS[$name]) . ";\n\n";
        }
    }
    return '<pre>' . $this->htmlEncode(rtrim($request, "\n")) . '</pre>';
}

                protected function shouldRenderSimpleHtml()
{
    return YII_ENV_TEST || Yii::$app->request->getIsAjax();
}

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 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);
            
            if ($event->handled) {
                return;
            }
        }
    }
    
    Event::trigger($this, $name, $event);
}

Version Description 2.0.32 this will not do anything if the error handler was not registered

                public function unregister()
{
    if ($this->_registered) {
        $this->_memoryReserve = null;
        $this->_workingDirectory = null;
        restore_error_handler();
        restore_exception_handler();
        $this->_registered = false;
    }
}

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