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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>References all variables available in global scope</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.variables.superglobals.html">Superglobals</a></div> <div class="next" style="text-align: right; float: right;"><a href="reserved.variables.server.html">$_SERVER</a></div> <div class="up"><a href="reserved.variables.html">Predefined variables</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="reserved.variables.globals" class="refentry"> <div class="refnamediv"> <h1 class="refname">$GLOBALS</h1> <p class="refpurpose"><span class="refname">$GLOBALS</span> — <span class="dc-title">References all variables available in global scope</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <p class="para"> An associative <a href="language.types.array.html" class="type array">array</a> containing references to all variables which are currently defined in the global scope of the script. The variable names are the keys of the array. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="variable.globals.basic" name="variable.globals.basic"> <p><b>Example #1 <var class="varname">$GLOBALS</var> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">test</span><span style="color: #007700">() {<br /> </span><span style="color: #0000BB">$foo </span><span style="color: #007700">= </span><span style="color: #DD0000">"local variable"</span><span style="color: #007700">;<br /><br /> echo </span><span style="color: #DD0000">'$foo in global scope: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$GLOBALS</span><span style="color: #007700">[</span><span style="color: #DD0000">"foo"</span><span style="color: #007700">] . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /> echo </span><span style="color: #DD0000">'$foo in current scope: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$foo </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$foo </span><span style="color: #007700">= </span><span style="color: #DD0000">"Example content"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">test</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output something similar to:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>$foo in global scope: Example content$foo in current scope: local variable</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: This is a 'superglobal', orautomatic global, variable. This simply means that it is available inall scopes throughout a script. There is no need to do <strong class="command">global $variable;</strong> to access it within functions or methods.<br /></p></blockquote> <blockquote><p><b class="note">Note</b>: <b>Variable availability</b><br /> Unlike all of the other <a href="language.variables.superglobals.html" class="link">superglobals</a>, <var class="varname">$GLOBALS</var> has essentially always been available in PHP. <br /> </p></blockquote> </div> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="language.variables.superglobals.html">Superglobals</a></div> <div class="next" style="text-align: right; float: right;"><a href="reserved.variables.server.html">$_SERVER</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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