set_exception_handler Sets a user-defined exception handler function &reftitle.description; callableset_exception_handler callableexception_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. &reftitle.parameters; exception_handler Name of the function to be called when an uncaught exception occurs. This handler function needs to accept one parameter, which will be the exception object that was thrown. This is the handler signature before PHP 7: voidhandler Exceptionex Since PHP 7, most errors are reported by throwing Error exceptions, which will be caught by the handler as well. Both Error and Exception implements the Throwable interface. This is the handler signature since PHP 7: voidhandler Throwableex &null; may be passed instead, to reset this handler to its default state. Note that providing an explicit Exception type hint for the ex parameter in your callback will cause issues with the changed exception hierarchy in PHP 7. &reftitle.returnvalues; Returns the name of the previously defined exception handler, or &null; on error. If no previous handler was defined, &null; is also returned. &reftitle.changelog; &Version; &Description; 7.0.0 The type of parameter passed into exception_handler changed from Exception to Throwable 5.5.0 Previously, if &null; was passed then this function returned &true;. It returns the previous handler since PHP 5.5.0. &reftitle.examples; getMessage(), "\n"; } set_exception_handler('exception_handler'); throw new Exception('Uncaught Exception'); echo "Not Executed\n"; ?> ]]> &reftitle.seealso; restore_exception_handler restore_error_handler error_reporting PHP 5 Exceptions