php-doc-en/reference/errorfunc/functions/restore-error-handler.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.8 $ -->
<!-- splitted from ./en/functions/errorfunc.xml, last change in rev 1.1 -->
  <refentry id="function.restore-error-handler">
   <refnamediv>
    <refname>restore_error_handler</refname>
    <refpurpose>
     Restores the previous error handler function
    </refpurpose>
   </refnamediv>
   <refsect1>
    &reftitle.description;
     <methodsynopsis>
      <type>bool</type><methodname>restore_error_handler</methodname>
      <void/>
     </methodsynopsis>
    <para>
     Used after changing the error handler function using
     <function>set_error_handler</function>, to revert to the previous error
     handler (which could be the built-in or a user defined function). This
     function always returns &true;.
    </para>
    <para>
     See also <function>error_reporting</function>,
     <function>set_error_handler</function>,
     <function>restore_exception_handler</function>,
     <function>trigger_error</function>.
    </para>
    <para>
     The example below shows the handling of internal exceptions by 
     triggering errors and handling them with a user defined function. It then
     restores the original PHP error handling:
     <example>
      <title>
       Error handling with <function>set_error_handler</function>,
       <function>trigger_error</function> and 
       <function>restore_error_handler</function>
      </title>
      <programlisting role="php">
<![CDATA[
<?php
// set the error reporting level for this script
error_reporting(E_USER_ERROR | E_USER_WARNING | E_USER_NOTICE);

// error handler function
function myErrorHandler($errno, $errstr, $errfile, $errline) 
{
    switch ($errno) {
    case E_USER_ERROR:
        echo "<b>My ERROR</b> [$errno] $errstr<br />\n";
        echo "  Fatal error in line $errline of file $errfile";
        echo ", PHP " . PHP_VERSION . " (" . PHP_OS . ")<br />\n";
        echo "Aborting...<br />\n";
        exit(1);
        break;
    case E_USER_WARNING:
        echo "<b>My WARNING</b> [$errno] $errstr<br />\n";
        break;
    case E_USER_NOTICE:
        echo "<b>My NOTICE</b> [$errno] $errstr<br />\n";
        break;
    default:
        echo "My unkown error type: [$errno] $errstr<br />\n";
        break;
    }
}

set_error_handler("myErrorHandler");
trigger_error('Test error', E_USER_WARNING);

restore_error_handler(); // Will restore standard PHP handler
trigger_error('Test error', E_USER_WARNING);
?>
]]>
      </programlisting>
      &example.outputs.similar;
      <screen>
<![CDATA[
My ERROR [512] Test error

Warning: Test error in C:\Program Files\Apache Group\Apache2\htdocs\readdir.php on line 45
]]>
      </screen>
     </example>
    </para>
   </refsect1>
  </refentry>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"../../../../manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->