set_exception_handler Sets a user-defined exception handler function &reftitle.description; stringarrayobjectnullset_exception_handler callablenullcallback Sets the default exception handler if an exception is not caught within a try/catch block. Execution will stop after the callback is called. &reftitle.parameters; callback 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. &reftitle.returnvalues; Returns the previously defined exception handler, or &null; on error. If no previous handler was defined, &null; is also returned. &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