php-doc-en/reference/outcontrol/examples.xml

<?xml version="1.0" encoding="utf-8"?>
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<appendix xml:id="outcontrol.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  &reftitle.examples;

  <section xml:id="outcontrol.examples.basic">
  <title>Basic usage</title>
  <para>
   <example>
    <title>Output Control example</title>
    <programlisting role="php">
<![CDATA[
<?php

ob_start();
echo "Hello\n";

setcookie("cookiename", "cookiedata");

ob_end_flush();

?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   In the above example, the output from <function>echo</function>
   would be stored in the output buffer until
   <function>ob_end_flush</function> was called. In the mean time,
   the call to <function>setcookie</function> successfully stored a
   cookie without causing an error. (Headers cannot normally be sent
   to the browser after data has already been sent.)
  </para>
 </section>

  <section xml:id="outcontrol.examples.rewrite">
  <title>Output rewrite usage</title>
  <para>
   Since PHP 7.1.0, <function>output_add_rewrite_var</function>, <function>output_reset_rewrite_vars</function> use dedicated output buffer. i.e. It does not use <link linkend="ini.session.use-trans-sid">trans sid</link> output buffer. 
  </para>
  <para>
   <example>
    <title>Output rewrite example</title>
    <programlisting role="php">
<![CDATA[
<?php
// This code works with PHP 7.1.0, 7.0.10, 5.6.25 and up.

// HTTP_HOST is default target host. Set manually to make sample code works.
$_SERVER['HTTP_HOST'] = 'php.net';

// Output rewriter only rewrite form. Add a=href.
// Tags can be specified tag_name=url_attr, e.g. img=src,iframe=src
// No space allowed between settings.
// Form tag is special tag that add hidden input.
ini_set('url_rewriter.tags','a=href,form=');
var_dump(ini_get('url_rewriter.tags'));

// This is added to URL and form
output_add_rewrite_var('test', 'value');
?>
<a href="//php.net/index.php?bug=1234">bug1234</a>
<form action="https://php.net/?bug=1234&edit=1" action="post">
 <input type="text" name="title" />
</form>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
<a href="//php.net/?bug=1234&test=value">bug1234</a>
<form action="https://php.net/?bug=1234&edit=1" method="post"><input type="hidden" name="test" value="value" />
 <input type="text" name="title" />
</form>
]]>
    </screen>
   </example>
  </para>
  <para>
   Since PHP 7.1.0, output rewrite functions have it's own INI settings, <link linkend="ini.url-rewriter.tags">url_rewriter.tags</link> and <link linkend="ini.url-rewriter.hosts">url_rewriter.hosts</link>. 
  </para>
 </section>

</appendix>

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