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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 288721 $ -->
<phpdoc:varentry xmlns:phpdoc="http://php.net/ns/phpdoc" xml:id="reserved.variables.environment" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" role="noversion">
<refnamediv>
<refname>$_ENV</refname>
<refname>$HTTP_ENV_VARS [deprecated]</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>
<simpara>
<varname>$HTTP_ENV_VARS</varname> contains the same initial
information, but is not a <link linkend="language.variables.superglobals">superglobal</link>.
(Note that <varname>$HTTP_ENV_VARS</varname> and <varname>$_ENV</varname>
are different variables and that PHP handles them as such)
</simpara>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>4.1.0</entry>
<entry>
Introduced <varname>$_ENV</varname> that deprecated
<varname>$HTTP_ENV_VARS</varname>.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example xml:id="variable.env.basic">
<title><varname>$_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;
¬e.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>
</phpdoc:varentry>
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sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
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sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
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