# Abstract Class yii\base\ErrorHandler

Inheritance | yii\base\ErrorHandler » yii\base\Component » yii\base\BaseObject
Implements | yii\base\Configurable
Subclasses | yii\console\ErrorHandler, yii\web\ErrorHandler
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/base/ErrorHandler.php

ErrorHandler handles uncaught PHP errors and exceptions.

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.

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$behaviors | yii\base\Behavior[] | List of behaviors attached to this component. This property is read-only. | yii\base\Component
$discardExistingOutput | boolean | Whether to discard any existing page output before error display. | yii\base\ErrorHandler
$exception | Exception|null | The exception that is being handled currently. | yii\base\ErrorHandler
$memoryReserveSize | integer | The size of the reserved memory. | yii\base\ErrorHandler
$silentExitOnException | boolean | If true - `handleException()` will finish script with `ExitCode::OK`. | yii\base\ErrorHandler

## Public Methods

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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
clearOutput() | Removes all output echoed before calling this method. | yii\base\ErrorHandler
convertExceptionToError() | Converts an exception into a PHP error. | yii\base\ErrorHandler
convertExceptionToString() | Converts an exception into a simple string. | yii\base\ErrorHandler
convertExceptionToVerboseString() | Converts an exception into a string that has verbose information about the exception and its trace. | yii\base\ErrorHandler
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
getBehavior() | Returns the named behavior object. | yii\base\Component
getBehaviors() | Returns all behaviors attached to this component. | yii\base\Component
handleError() | Handles PHP execution errors such as warnings and notices. | yii\base\ErrorHandler
handleException() | Handles uncaught PHP exceptions. | yii\base\ErrorHandler
handleFatalError() | Handles fatal PHP errors. | yii\base\ErrorHandler
handleHhvmError() | Handles HHVM execution errors such as warnings and notices. | yii\base\ErrorHandler
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() |  | yii\base\ErrorHandler
logException() | Logs the given exception. | yii\base\ErrorHandler
off() | Detaches an existing event handler from this component. | yii\base\Component
on() | Attaches an event handler to an event. | yii\base\Component
register() | Register this error handler. | yii\base\ErrorHandler
trigger() | Triggers an event. | yii\base\Component
unregister() | Unregisters this error handler by restoring the PHP error and exception handlers. | yii\base\ErrorHandler

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
handleFallbackExceptionMessage() | Handles exception thrown during exception processing in handleException(). | yii\base\ErrorHandler
renderException() | Renders the exception. | yii\base\ErrorHandler

## Property Details

$discardExistingOutput public property

Whether to discard any existing page output before error display. Defaults to true.

public boolean $discardExistingOutput = true
$exception public property

The exception that is being handled currently.

public Exception|null $exception = null
$memoryReserveSize public property

The size of the reserved memory. A portion of memory is pre-allocated so that when an out-of-memory issue occurs, the error handler is able to handle the error with the help of this reserved memory. If you set this value to be 0, no memory will be reserved. Defaults to 256KB.

public integer $memoryReserveSize = 262144
$silentExitOnException public property (available since version 2.0.36)

If true - `handleException()` will finish script with `ExitCode::OK`. false - `ExitCode::UNSPECIFIED_ERROR`.

public boolean $silentExitOnException = null

## Method Details

clearOutput() public method

Removes all output echoed before calling this method.

public void clearOutput ( )

convertExceptionToError() public static method

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 void convertExceptionToError ( $exception )
$exception | Exception|Throwable | The exception to convert to a PHP error.

convertExceptionToString() public static method

Converts an exception into a simple string.

public static string convertExceptionToString ( $exception )
$exception | Exception|Error|Throwable | The exception being converted
return | string | The string representation of the exception.

convertExceptionToVerboseString() public static method (available since version 2.0.14)

Converts an exception into a string that has verbose information about the exception and its trace.

public static string convertExceptionToVerboseString ( $exception )
$exception | Exception|Error|Throwable | The exception being converted
return | string | The string representation of the exception.

handleError() public method

Handles PHP execution errors such as warnings and notices.

This method is used as a PHP error handler. It will simply raise an yii\base\ErrorException.

public boolean handleError ( $code, $message, $file, $line )
$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.
return | boolean | Whether the normal error handler continues.
throws | yii\base\ErrorException |

handleException() public method

Handles uncaught PHP exceptions.

This method is implemented as a PHP exception handler.

public void handleException ( $exception )
$exception | Exception | The exception that is not caught

handleFallbackExceptionMessage() protected method (available since version 2.0.11)

Handles exception thrown during exception processing in handleException().

protected void handleFallbackExceptionMessage ( $exception, $previousException )
$exception | Exception|Throwable | Exception that was thrown during main exception processing.
$previousException | Exception | Main exception processed in handleException().

handleFatalError() public method

Handles fatal PHP errors.

public void handleFatalError ( )

handleHhvmError() public method (available since version 2.0.6)

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 |

init() public method

public void init ( )

logException() public method (available since version 2.0.3)

Logs the given exception.

public void logException ( $exception )
$exception | Exception | The exception to be logged

register() public method (available since version 2.0.32)

Register this error handler.

public void register ( )

renderException() protected abstract method

Renders the exception.

protected abstract void renderException ( $exception )
$exception | Exception|Error|Throwable | The exception to be rendered.

unregister() public method (available since version 2.0.32)

Unregisters this error handler by restoring the PHP error and exception handlers.

public void unregister ( )