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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>Predefined variables</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="language.references.spot.html">Spotting References</a></div> <div class="next" style="text-align: right; float: right;"><a href="language.variables.superglobals.html">Superglobals</a></div> <div class="up"><a href="langref.html">Language Reference</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div> <h1 class="title">Predefined variables</h1> <div class="partintro"> <p class="para"> PHP provides a large number of predefined variables to all scripts. The variables represent everything from <a href="language.variables.external.html" class="link">external variables</a> to built-in environment variables, last error messages to last retrieved headers. </p> <p class="para"> See also the FAQ titled "<a href="faq.using.html#faq.register-globals" class="link">How does register_globals affect me?</a>" </p> </div> <h2>Table of Contents</h2><ul class="chunklist chunklist_reference"><li><a href="language.variables.superglobals.html">Superglobals</a> 鈥⌨️ 快捷键说明
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