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

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<!-- $Revision: 1.8 $ -->
 <reference id="ref.outcontrol">
  <title>Output Control Functions</title>
  <titleabbrev>Output Control</titleabbrev>

  <partintro>
   <section id="outcontrol.intro">
    &reftitle.intro;
    <para>
     The Output Control functions allow you to control when output is
     sent from the script. This can be useful in several different
     situations, especially if you need to send headers to the browser
     after your script has began outputting data. The Output Control
     functions do not affect headers sent using
     <function>header</function> or <function>setcookie</function>,
     only functions such as <function>echo</function> and data between
     blocks of PHP code.
    </para>
   </section>

   <section id="outcontrol.requirements">
    &reftitle.required;
    &no.requirement;
   </section>

   <section id="outcontrol.installation">
    &reftitle.install;
    &no.install;
   </section>

   &reference.outcontrol.ini;

   <section id="outcontrol.resources">
    &reftitle.resources;
    &no.resource;
   </section>

   <section id="outcontrol.constants">
    &reftitle.constants;
    &no.constants;
   </section>

   <section id="outcontrol.examples">
   &reftitle.examples;
    <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>
    <note>
     <para>
      When upgrading from PHP 4.1 (& 4.2) to 4.3 that due to a bug in
      earlier versions you must ensure that
      <literal>implict_flush</literal> is <literal>OFF</literal> in
      your <literal>php.ini</literal>, otherwise any output with
      <function>ob_start</function> will be not be hidden from output.
     </para>
    </note>
   </section>

   <section id="outcontrol.seealso">
    &reftitle.seealso;
    <para>
     See also <function>header</function> and
     <function>setcookie</function>.
    </para>
   </section>
  </partintro>

&reference.outcontrol.functions;

 </reference>
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