Created new superglobals page.

Also, superglobal content from ../variables.xml was folded into this page.


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@257945 c90b9560-bf6c-de11-be94-00142212c4b1

language/predefined/variables/superglobals.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- $Revision: 1.1 $ -->
+
+<refentry xml:id="language.variables.superglobals" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
+ <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 $variable;</command> to access them within functions
+   or methods.
+  </para>
+  <para>
+   These superglobal variables are:
+   <simplelist>
+    <member><link linkend="reserved.variables.globals">$GLOBALS</link></member>
+    <member><link linkend="reserved.variables.server">$_SERVER</link></member>
+    <member><link linkend="reserved.variables.get">$_GET</link></member>
+    <member><link linkend="reserved.variables.post">$_POST</link></member>
+    <member><link linkend="reserved.variables.files">$_FILES</link></member>
+    <member><link linkend="reserved.variables.cookies">$_COOKIE</link></member>
+    <member><link linkend="reserved.variables.session">$_SESSION</link></member>
+    <member><link linkend="reserved.variables.request">$_REQUEST</link></member>
+    <member><link linkend="reserved.variables.environment">$_ENV</link></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>
+
+</refentry>
+ 
+<!-- Keep this comment at the end of the file
+Local variables:
+mode: sgml
+sgml-omittag:t
+sgml-shorttag:t
+sgml-minimize-attributes:nil
+sgml-always-quote-attributes:t
+sgml-indent-step:1
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+sgml-default-dtd-file:"../../../../manual.ced"
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+sgml-local-catalogs:nil
+sgml-local-ecat-files:nil
+End:
+vim600: syn=xml fen fdm=syntax fdl=2 si
+vim: et tw=78 syn=sgml
+vi: ts=1 sw=1
+-->
+