restore_error_handler

(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)

restore_error_handlerRéactive l'ancienne fonction de gestion des erreurs

Description

restore_error_handler(): true

Utilisée après avoir modifié la fonction de gestion des erreurs, grâce à set_error_handler(), restore_error_handler() permet de réutiliser l'ancienne version de gestion des erreurs (qui peut être la fonction PHP par défaut, ou une autre fonction utilisateur).

Liste de paramètres

Cette fonction ne contient aucun paramètre.

Valeurs de retour

Retourne toujours true.

Exemples

Exemple #1 Exemple avec restore_error_handler()

Si unserialize() cause une erreur, alors le gestionnaire d'erreurs original est restauré.

<?php
function unserialize_handler($errno, $errstr)
{
echo
"Valeur incorrectement sérialisée.\n";
}

$serialized = 'foo';
set_error_handler('unserialize_handler');
$original = unserialize($serialized);
restore_error_handler();
?>

L'exemple ci-dessus va afficher :

Valeur incorrectement sérialisée.

Voir aussi

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User Contributed Notes 4 notes

up
28
edgarinvillegas at hotmail dot com
16 years ago
Isolde is kind of wrong. The error handlers are stacked with set_error_handler(), and popped with restore_error_handler(). Here i put an example:

<?php
mysql_connect
("inexistent"); //Generate an error. The actual error handler is set by default

function foo1() {echo "<br>Error foo1<br>";}
function
foo2() {echo "<br>Error foo2<br>";}
function
foo3() {echo "<br>Error foo3<br>";}

set_error_handler("foo1"); //current error handler: foo1
set_error_handler("foo2"); //current error handler: foo2
set_error_handler("foo3"); //current error handler: foo3

mysql_connect("inexistent");
restore_error_handler(); //now, current error handler: foo2
mysql_connect("inexistent");
restore_error_handler(); //now, current error handler: foo1
mysql_connect("inexistent");
restore_error_handler(); //now current error handler: default handler
mysql_connect("inexistent");
restore_error_handler(); //now current error handler: default handler (The stack can't pop more)
?>
up
0
masterada at gmail dot com
7 years ago
Calling restore_error_handler from within an error handler might result in unexpected behaviour:

<?php
error_reporting
(0);

set_error_handler('handleError1');
trigger_error('1-stack:h1');

set_error_handler('handleError2');
trigger_error('2-stack:h1,h2');

trigger_error('6-stack:h1,h2');
trigger_error('7-stack:h1,h2');

function
handleError1($code, $message, $file = '', $line = 0, $context = array())
{
echo
__METHOD__ . ' ' . $message . PHP_EOL;
}

function
handleError2($code, $message, $file = '', $line = 0, $context = array())
{
trigger_error('3-DEFAULT'); // This will use the php's default error handler

echo __METHOD__ . ' ' . $message . PHP_EOL;

set_error_handler('handleError3');
trigger_error('4-stack:h1,h2,h3');

restore_error_handler(); // This will restore the handleError1 instead of the default error handler
trigger_error('5-DEFAULT');
}

function
handleError3($code, $message, $file = '', $line = 0, $context = array())
{
echo
__METHOD__ . ' ' . $message . PHP_EOL;
}

?>

The above code will output:

handleError1 1-stack:h1
handleError2 2-stack:h1,h2
handleError3 4-stack:h1,h2,h3
handleError1 5-DEFAULT
handleError1 6-stack:h1,h2
handleError1 7-stack:h1,h2

The following workaround can be used:

<?php

error_reporting
(0);

set_error_handler('handleError1');
trigger_error('1-stack:h1');

set_error_handler('handleError2');
trigger_error('2-stack:h1,h2');

trigger_error('6-stack:h1,h2');
trigger_error('7-stack:h1,h2');

function
handleError1($code, $message, $file = '', $line = 0, $context = array())
{
echo
__METHOD__ . ' ' . $message . PHP_EOL;
}

function
handleError2($code, $message, $file = '', $line = 0, $context = [])
{
restore_error_handler(); // This will restore the previous error handler
set_error_handler('count', 0); // Set a dummy method for error handling, it will never be called because $error_type = 0
try
{
trigger_error('3-DEFAULT');

echo
__METHOD__ . ' ' . $message . PHP_EOL;

set_error_handler('handleError3');
trigger_error('4-stack:h1,h2,h3');

restore_error_handler();
trigger_error('5-DEFAULT');
}
finally
{
restore_error_handler(); // Restore the previous error handler
set_error_handler('handleError2'); // Set the current error handler again
}
}

function
handleError3($code, $message, $file = '', $line = 0, $context = [])
{
echo
__METHOD__ . ' ' . $message . PHP_EOL;
}
?>

which will output:

handleError1 1-stack:h1
handleError2 2-stack:h1,h2
handleError3 4-stack:h1,h2,h3
handleError2 6-stack:h1,h2
handleError3 4-stack:h1,h2,h3
handleError2 7-stack:h1,h2
handleError3 4-stack:h1,h2,h3
up
0
lsole at maresme dot net
20 years ago
As the docs say, restore_error_handler() revert to the *previous error handler*... even if it is the same. A bug made me set twice my custom error handler and later when I was calling restore_error_handler() to restore the built-in handler nothing seemed to happen... this puzzled me for a while!
up
-2
TiMESPLiNTER
9 years ago
Works also for restoring nested error handlers:

<?php

error_reporting
(E_ALL);

echo
'<pre>';

set_error_handler(function($errno, $errstr, $errfile, $errline, array $errcontext) {
echo
'ErrorHandler 1: ' , $errstr , PHP_EOL;
});

trigger_error('Error 1');

set_error_handler(function($errno, $errstr, $errfile, $errline, array $errcontext) {
echo
'ErrorHandler 2: ' , $errstr , PHP_EOL;
});

trigger_error('Error 2');

restore_error_handler();

trigger_error('Error 3');

restore_error_handler();

trigger_error('Error 4');

?>
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