PHP restore_error_handler() Function

The PHP restore_error_handler() function restores the previous error handler function. This function is used after changing the error handler function using set_error_handler(), to revert to the previous error handler (which could be the built-in or a user defined function).

Syntax

restore_error_handler()

Parameters

No parameter is required.

Return Value

Always returns true.

Example: restore_error_handler() example

The example below shows the usage of restore_error_handler() function.

<?php
//a user-defined error handler function
function myErrorHandler($errno, $errstr, $errfile, $errline) {
  echo "<b>My ERROR</b> [$errno] $errstr<br>\n";
  echo "Error on line $errline in file $errfile<br>\n";
  echo "Aborting...<br>\n";
}

//setting user-defined error handler function
set_error_handler("myErrorHandler");

$test = 100;

//triggering user-defined error handler function
if ($test==100) {
  trigger_error("A custom error has been triggered");
}

//restoring the previous (built-in) error handler
restore_error_handler();
?>

The output of the above code will be:

My ERROR [1024] A custom error has been triggered
Error on line 20 in file index.php
Aborting...

❮ PHP Error Handling Reference