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set_exception_handler
(PHP 5, PHP 7)
set_exception_handler — Sets a user-defined exception handler function
Description
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.
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:
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:
NULLmay be passed instead, to reset this handler to its default state.CautionNote that providing an explicit Exception type hint for the
exparameter in your callback will cause issues with the changed exception hierarchy in PHP 7.
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.
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.
|
Examples
Example #1 set_exception_handler() example
<?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";
?>
See Also
- restore_exception_handler() - Restores the previously defined exception handler function
- restore_error_handler() - Restores the previous error handler function
- error_reporting() - Sets which PHP errors are reported
- information about the callback type
- PHP 5 Exceptions
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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