# PHP set_exception_handler() Function

PHP Error Reference

## Example

Set a user-defined exception handler function:

<?php
// A user-defined exception handler function
function myException($exception) {
echo "<b>Exception:</b> ", $exception->getMessage();
}
// Set user-defined exception handler function
set_exception_handler("myException");
// Throw exception
throw new Exception("Uncaught exception occurred!");
?>

The above code will output something like this:

Exception: Uncaught exception occurred!

## Definition and Usage

The set_exception_handler() function sets a user-defined exception handler function.

The script will stop executing after the exception handler is called.

## Syntax

set_exception_handler(exceptionhandler);

Parameter | Description
--- | ---
exceptionhandler | Required. Specifies the name of the function to be run when an uncaught exception occurs. NULL can be passed instead, to reset this handler to its default state

## Technical Details

Return Value: | A string that contains the previously defined exception handler, or NULL on error or if no previous handler was defined
PHP Version: | 5.0+
PHP Changelog: | Previously, if NULL was passed then this function returned TRUE. It returns the previous handler since PHP 5.5

PHP Error Reference

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