set_exception_handler

(PHP 5, PHP 7, PHP 8)

set_exception_handler — Sets a user-defined exception handler function

Description

set_exception_handler(?callable $callback): ?callable

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

Parameters

callback

The function to be called when an uncaught exception occurs. This handler function needs to accept one parameter, which will be the Throwable object that was thrown. Both Error and Exception implement the Throwable interface. This is the handler signature:

handler(Throwable $ex): void

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

Return Values

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

Examples

Example #1 set_exception_handler() example

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

set_exception_handler('exception_handler');

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

See Also