PHPのお勉強！

PHP TOP
PHP 8.4.2 Released!

    restore_error_handler

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

    restore_error_handler — 以前のエラーハンドラ関数を回復する

    説明

    restore_error_handler(): true

    set_error_handler() を使用してエラーハンドラ関数を 変更した後、元のエラーハンドラ(組込またはユーザー定義関数)に戻すために 使用されます。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    常に true を返します。

    例

    例1 restore_error_handler() の例

    unserialize() がエラーを発生した場合に 元のエラーハンドラに戻すことにする

    <?php
    function unserialize_handler($errno, $errstr)
    {
    echo     "Invalid serialized value.\n";
    }

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

    上の例の出力は以下となります。

    Invalid serialized value.

    参考

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    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');

    ?>
    ＋add a note
    To Top