Error Handling Functions
PHP Manual

set_exception_handler

Sets a user-defined exception handler function

Description

callable set_exception_handler ( callable $exception_handler )

Sets the default exception handler if an exception is not caught within a try/catch block. Execution will stop after the exception_handler is called.

Parameters

exception_handler

Name of the function to be called when an uncaught exception occurs. This function must be defined before calling set_exception_handler. This handler function needs to accept one parameter, which will be the exception object that was thrown. This is the handler signature:

void handler ( Exception $ex )

NULL may be passed instead, to reset this handler to its default state.

Return Values

Returns the name of the previously defined exception handler, or NULL on error. If no previous handler was defined, NULL is also returned.

Changelog

Version Description
5.5.0 Previously, if NULL was passed then this function returned TRUE. It returns the previous handler since PHP 5.5.0.

Examples

Example #1 set_exception_handler example

<?php
function exception_handler($exception) {
  echo "Uncaught exception: " , $exception->getMessage(), "\n";
}

set_exception_handler('exception_handler');

throw new Exception('Uncaught Exception');
echo "Not Executed\n";
?>

See Also