(PHP 4 >= 4.0.1, PHP 5, PHP 7)
restore_error_handler — Restores the previous error handler function
restore_error_handler ( ) : bool
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).
This function always returns true.
Example #1 restore_error_handler() example
Decide if unserialize() caused an error, then restore the original error handler.
<?php
function unserialize_handler($errno, $errstr)
{
echo "Invalid serialized value.\n";
}
$serialized = 'foo';
set_error_handler('unserialize_handler');
$original = unserialize($serialized);
restore_error_handler();
?> The above example will output:
Invalid serialized value.
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https://www.php.net/manual/en/function.restore-error-handler.php