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

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 <reference id="ref.apache">
  <title>Apache-specific Functions</title>
  <titleabbrev>Apache</titleabbrev>
  <partintro>
   <section id="apache.intro">
    &reftitle.intro;
    <para>
     These functions are only available when running PHP as an Apache module.
    </para>
    <note>
     <simpara>
      As of PHP 4.3.2, <envar>PATH_TRANSLATED</envar> is no longer set 
      implicitly under the Apache 2 <acronym>SAPI</acronym> in contrast 
      to the situation in Apache 1, where it's set to the same value as 
      the <envar>SCRIPT_FILENAME</envar> server variable when it's not 
      populated by Apache.  This change was made to comply with the 
      <acronym>CGI</acronym> specification that 
      <envar>PATH_TRANSLATED</envar> should only exist if 
      <envar>PATH_INFO</envar> is defined.
     </simpara>
     <simpara>
      Apache 2 users may use <literal>AcceptPathInfo = On</literal> inside
      <filename>httpd.conf</filename> to define <envar>PATH_INFO</envar>.
     </simpara>
    </note>
   </section>

   <section id="apache.installation">
    &reftitle.install;
    <para>
     For PHP installation on Apache see the <link
      linkend='install'>installation chapter</link>.
    </para>
   </section>

   &reference.apache.ini;

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

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

&reference.apache.functions;

 </reference>
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