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<refentry xml:id="function.restore-error-handler" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>restore_error_handler</refname>
  <refpurpose>Restores the previous error handler function</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &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). 
  </para>
 </refsect1>

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

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>restore_error_handler</function> example</title>
    <para>
     Decide if <function>unserialize</function> caused an error, then
     restore the original error handler.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
function unserialize_handler($errno, $errstr)
{
    echo "Invalid serialized value.\n";
}

$serialized = 'foo';
set_error_handler('unserialize_handler');
$original = unserialize($serialized);
restore_error_handler();
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Invalid serialized value.
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    Calling <function>restore_error_handler</function> from the
    <literal>error_handler</literal> function is ignored.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>error_reporting</function></member>
    <member><function>set_error_handler</function></member>
    <member><function>restore_exception_handler</function></member>
    <member><function>trigger_error</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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