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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 288721 $ -->
<phpdoc:varentry xmlns:phpdoc="http://php.net/ns/phpdoc" xml:id="language.variables.superglobals" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" role="noversion">
<refnamediv>
<refname>Superglobals</refname>
<refpurpose>Superglobals are built-in variables that are always available in all scopes</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<para>
Several predefined variables in PHP are "superglobals", which means they
are available in all scopes throughout a script. There is no need to do
<command>global $variable;</command> to access them within functions
or methods.
</para>
<para>
These superglobal variables are:
<simplelist>
<member><varname>$GLOBALS</varname></member>
<member><varname>$_SERVER</varname></member>
<member><varname>$_GET</varname></member>
<member><varname>$_POST</varname></member>
<member><varname>$_FILES</varname></member>
<member><varname>$_COOKIE</varname></member>
<member><varname>$_SESSION</varname></member>
<member><varname>$_REQUEST</varname></member>
<member><varname>$_ENV</varname></member>
</simplelist>
</para>
</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>
Superglobals were introduced to PHP.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<title>Variable availability</title>
<para>
By default, all of the superglobals are available but there are
directives that affect this availability. For further information, refer
to the documentation for
<link linkend="ini.variables-order">variables_order</link>.
</para>
</note>
<note>
<title>Dealing with register_globals</title>
<para>
If the deprecated <link linkend="ini.register-globals">register_globals</link>
directive is set to <literal>on</literal> then the variables within will
also be made available in the global scope of the script. For example,
<varname>$_POST['foo']</varname> would also exist as <varname>$foo</varname>.
</para>
<para>
For related information, see the FAQ titled
"<link linkend="faq.register-globals">How does register_globals affect me?</link>"
</para>
</note>
<note>
<title>Variable variables</title>
<para>
Superglobals cannot be used as
<link linkend="language.variables.variable">variable variables</link>
inside functions or class methods.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><link linkend="language.variables.scope">variable scope</link></member>
<member>The <link linkend="ini.variables-order">variables_order</link> directive</member>
<member><link linkend="book.filter">The filter extension</link></member>
</simplelist>
</para>
</refsect1>
</phpdoc:varentry>
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