PHP Manual: Gets the user-defined exception handler function

Description

callablenull get_exception_handler()

Returns the current exception handler function, if any.

Parameters

This function has no parameters.

Return Values

Returns the currently defined exception handler. If no handler is defined, null is returned.

The returned handler is the exact callable value that was passed to set_exception_handler to define it.

Examples

Example #1 get_exception_handler example

<?php

$handler = function (Throwable $ex) {
     echo "Exception: " . $ex::class . ": " . $ex->getMessage() . "\n";
};

var_dump(get_exception_handler()); // NULL

set_exception_handler($handler);

var_dump(get_exception_handler() === $handler); // bool(true)

?>

Notes

Tip

Prior to PHP 8.5.0, this functionality can be provided by the following polyfill:

<?php
if (!function_exists('get_exception_handler')) {
    function noop_exception_handler() {
    }
    function get_exception_handler(): ?callable {
        $handler = set_exception_handler('noop_exception_handler');
        restore_exception_handler();
        return $handler;
    }
}
?>