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PHP Function set_exception_handler()


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Syntax

string set_exception_handler ( callback $exception_handler );

Definition and Usage

This function 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.

Paramters

ParameterDescription
exception_handlerName 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.

Return Value

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

Example

Following is the usage of this function:

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

# This will restore first exception.
set_exception_handler();

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

This will produce following result:

Uncaught exception : Uncaught Exception

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