Store copies of your important files online for free.            HOME

Sets a user-defined exception handler function
Error Handling Functions
PHP Manual


(PHP 5)

set_exception_handler Sets a user-defined exception handler function


callable set_exception_handler ( callable $exception_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.



Name of the function to be called when an uncaught exception occurs. This function must be defined before calling set_exception_handler(). This handler function needs to accept one parameter, which will be the exception object that was thrown. This is the handler signature:

void handler ( Exception $ex )

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

Return Values

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


Version Description
5.5.0 Previously, if NULL was passed then this function returned TRUE. It returns the previous handler since PHP 5.5.0.


Example #1 set_exception_handler() example

function exception_handler($exception) {
"Uncaught exception: " $exception->getMessage(), "\n";


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

See Also

Error Handling Functions
PHP Manual