restore-exception-handler.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.restore-exception-handler" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>restore_exception_handler</refname>
  <refpurpose>
   Restores the previously defined exception handler function
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>restore_exception_handler</methodname>
   <void/>
  </methodsynopsis>
  <para>
   Used after changing the exception handler function using
   <function>set_exception_handler</function>, to revert to the previous
   exception handler (which could be the built-in or a user defined
   function).
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   This function always returns &true;.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>restore_exception_handler</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
    function exception_handler_1(Exception $e)
    {
        echo '[' . __FUNCTION__ . '] ' . $e->getMessage();
    }

    function exception_handler_2(Exception $e)
    {
        echo '[' . __FUNCTION__ . '] ' . $e->getMessage();
    }

    set_exception_handler('exception_handler_1');
    set_exception_handler('exception_handler_2');

    restore_exception_handler();

    throw new Exception('This triggers the first exception handler...');
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
[exception_handler_1] This triggers the first exception handler...
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>set_exception_handler</function></member>
    <member><function>set_error_handler</function></member>
    <member><function>restore_error_handler</function></member>
    <member><function>error_reporting</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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