PHP restore_error_handler() Function Usage and Example

PHP Error & Loggings Reference Manual

The restore_error_handler() function restores the previous error handler

Syntax

bool restore_error_handler(void);

Definition and Usage

　After changing the error handler with set_error_handler(), this function can be used to restore the previous error handler (which can be built-in or user-defined).

Parameter

Return Value

This function always returns TRUE.

Online Example

The following is the usage of this function, if unserialize() causes an error, the original error handler will be restored next.　

<?php
　　　function unserialize_handler($errno, $errstr) {
　　　　　　echo "Invalid hello value.\n";
　　　}
　　　
　　　$hello = 'abc';
　　　set_error_handler('unserialize_handler');
　　　
　　　$original = unserialize($hello);
　　　restore_error_handler();
?>

This will produce the following result-

Invalid hello value.

PHP Error & Loggings Reference Manual