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 handler function needs to accept one parameter, which will be the exception object that was thrown. This is the handler signature before PHP 7:
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:
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.
Returns the name of the previously defined exception handler, or NULL
on error. If no previous handler was defined, NULL
is also returned.
The type of parameter passed into exception_handler
changed from Exception to Throwable
Previously, if NULL
was passed then this function returned TRUE
. It returns the previous handler since PHP 5.5.0.
<?php function exception_handler($exception) { echo "Uncaught exception: " , $exception->getMessage(), "\n"; } set_exception_handler('exception_handler'); throw new Exception('Uncaught Exception'); echo "Not Executed\n"; ?>
callback -
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