output-add-rewrite-var.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.output-add-rewrite-var">
 <refnamediv>
  <refname>output_add_rewrite_var</refname>
  <refpurpose>Add URL rewriter values</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>output_add_rewrite_var</methodname>
   <methodparam><type>string</type><parameter>name</parameter></methodparam>
   <methodparam><type>string</type><parameter>value</parameter></methodparam>
  </methodsynopsis>
  <para>
   This function starts the <literal>'URL-Rewriter'</literal> output buffer handler
   if it is not active,
   stores the <parameter>name</parameter> and <parameter>value</parameter> parameters,
   and when the buffer is flushed rewrites the <acronym>URL</acronym>s
   and forms based on the applicable ini settings.
   Subsequent calls to this function will store all additional name/value pairs
   until the handler is turned off.
  </para>
  <para>
   When the output buffer is flushed
   (by calling <function>ob_flush</function>, <function>ob_end_flush</function>,
   <function>ob_get_flush</function> or at the end of the script)
   the <literal>'URL-Rewriter'</literal> handler adds the name/value pairs
   as query parameters to <acronym>URL</acronym>s in attributes of HTML tags
   and adds hidden fields to forms based on the values of the
   <link linkend="ini.url-rewriter.tags">url_rewriter.tags</link> and
   <link linkend="ini.url-rewriter.hosts">url_rewriter.hosts</link>
   configuration directives.
  </para>
  <para>
   Each name/value pair added to the <literal>'URL-Rewriter'</literal> handler
   is added to the <acronym>URL</acronym>s and/or forms
   even if this results in duplicate <acronym>URL</acronym> query parameters
   or elements with the same name attributes.
  </para>
  <note>
   <simpara>
    Once the <literal>'URL-Rewriter'</literal> handler has been turned off
    it cannot be started again.
   </simpara>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>name</parameter></term>
     <listitem>
      <para>
       The variable name.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>value</parameter></term>
     <listitem>
      <para>
       The variable value.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>7.1.0</entry>
       <entry>
        As of PHP 7.1.0, a dedicated output buffer is used,
        <link linkend="ini.url-rewriter.tags">url_rewriter.tags</link>
        is used solely for output functions and
        <link linkend="ini.url-rewriter.tags">url_rewriter.hosts</link> is available.
        Prior to PHP 7.1.0, rewrite variables set by <function>output_add_rewrite_var</function>
        shared an output buffer with transparent session id support
        (see <link linkend="ini.session.trans-sid-tags">session.trans_sid_tags</link>).
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>output_add_rewrite_var</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
ini_set('url_rewriter.tags', 'a=href,form=');

output_add_rewrite_var('var', 'value');

// some links
echo '<a href="file.php">link</a>
<a href="http://example.com">link2</a>';

// a form
echo '<form action="script.php" method="post">
<input type="text" name="var2" />
</form>';

print_r(ob_list_handlers());
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
<a href="file.php?var=value">link</a>
<a href="http://example.com">link2</a>

<form action="script.php" method="post">
<input type="hidden" name="var" value="value" />
<input type="text" name="var2" />
</form>

Array
(
    [0] => URL-Rewriter
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>output_reset_rewrite_vars</function></member>
    <member><function>ob_flush</function></member>
    <member><function>ob_list_handlers</function></member>
    <member><link linkend="ini.url-rewriter.tags">url_rewriter.tags</link></member>
    <member><link linkend="ini.url-rewriter.hosts">url_rewriter.hosts</link></member>
   </simplelist>
  </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:"~/.phpdoc/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
-->