env.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->

<refentry role="variable" xml:id="reserved.variables.environment" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>$_ENV</refname>
  <refpurpose>Environment variables</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <para>
   An associative <type>array</type> of variables passed to the current script
   via the environment method. 
  </para>

  <simpara>
   These variables are imported into PHP's global namespace from the
   environment under which the PHP parser is running. Many are
   provided by the shell under which PHP is running and different
   systems are likely running different kinds of shells, a
   definitive list is impossible. Please see your shell's
   documentation for a list of defined environment variables.
  </simpara>

  <simpara>
   Other environment variables include the CGI variables, placed
   there regardless of whether PHP is running as a server module or
   CGI processor.
  </simpara>

 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example xml:id="variable.env.basic">
    <title><varname>$_ENV</varname> example</title>
    <programlisting role="php">
<![CDATA[
<?php
echo 'My username is ' .$_ENV["USER"] . '!';
?>
]]>
    </programlisting>
    <simpara>
     Assuming "bjori" executes this script
    </simpara>
    &example.outputs.similar;
    <screen>
<![CDATA[
My username is bjori!
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="notes">
  &reftitle.notes;
  &note.is-superglobal;
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>getenv</function></member>
    <member><link linkend="book.filter">The filter extension</link></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
 
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