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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Superglobals are built-in variables that are always available in all scopes</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="reserved.variables.html">Predefined variables</a></div> <div class="next" style="text-align: right; float: right;"><a href="reserved.variables.globals.html">$GLOBALS</a></div> <div class="up"><a href="reserved.variables.html">Predefined variables</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="language.variables.superglobals" class="refentry"> <div class="refnamediv"> <h1 class="refname">Superglobals</h1> <p class="refpurpose"><span class="refname">Superglobals</span> — <span class="dc-title">Superglobals are built-in variables that are always available in all scopes</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <p class="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 <strong class="command">global $variable;</strong> to access them within functions or methods. </p> <p class="para"> These superglobal variables are: <ul class="simplelist"> <li class="member"><var class="varname"><a href="reserved.variables.globals.html" class="classname">$GLOBALS</a></var></li> <li class="member"><var class="varname"><a href="reserved.variables.server.html" class="classname">$_SERVER</a></var></li> <li class="member"><var class="varname"><a href="reserved.variables.get.html" class="classname">$_GET</a></var></li> <li class="member"><var class="varname"><a href="reserved.variables.post.html" class="classname">$_POST</a></var></li> <li class="member"><var class="varname"><a href="reserved.variables.files.html" class="classname">$_FILES</a></var></li> <li class="member"><var class="varname"><a href="reserved.variables.cookies.html" class="classname">$_COOKIE</a></var></li> <li class="member"><var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var></li> <li class="member"><var class="varname"><a href="reserved.variables.request.html" class="classname">$_REQUEST</a></var></li> <li class="member"><var class="varname"><a href="reserved.variables.environment.html" class="classname">$_ENV</a></var></li> </ul> </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.1.0</td> <td colspan="1" rowspan="1" align="left"> Superglobals were introduced to PHP. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <b>Variable availability</b><br /> By default, all of the superglobals are available but there are directives that affect this availability. For further information, refer to the documentation for <a href="ini.core.html#ini.variables-order" class="link">variables_order</a>. <br /> </p></blockquote> <blockquote><p><b class="note">Note</b>: <b>Dealing with register_globals</b><br /> If the deprecated <a href="ini.core.html#ini.register-globals" class="link">register_globals</a> directive is set to <i>on</i> then the variables within will also be made available in the global scope of the script. For example, <var class="varname"><a href="reserved.variables.post.html" class="classname">$_POST['foo']</a></var> would also exist as <var class="varname">$foo</var>. <br /> For related information, see the FAQ titled "<a href="faq.using.html#faq.register-globals" class="link">How does register_globals affect me?</a>" <br /> </p></blockquote> <blockquote><p><b class="note">Note</b>: <b>Variable variables</b><br /> Superglobals cannot be used as <a href="language.variables.variable.html" class="link">variable variables</a> inside functions or class methods. <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="language.variables.scope.html" class="link">variable scope</a></li> <li class="member">The <a href="ini.core.html#ini.variables-order" class="link">variables_order</a> directive</li> <li class="member"><a href="book.filter.html" class="link">The filter extension</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="reserved.variables.html">Predefined variables</a></div> <div class="next" style="text-align: right; float: right;"><a href="reserved.variables.globals.html">$GLOBALS</a></div> <div class="up"><a href="reserved.variables.html">Predefined variables</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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