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. (You can not normally send
   headers to the browser after data has already been sent.)
  </para>
 </section>
</appendix>

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