function.get-defined-vars.html
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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>Returns an array of all defined 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="function.floatval.html">floatval</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.get-resource-type.html">get_resource_type</a></div> <div class="up"><a href="ref.var.html">Variable handling Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.get-defined-vars" class="refentry"> <div class="refnamediv"> <h1 class="refname">get_defined_vars</h1> <p class="verinfo">(PHP 4 >= 4.0.4, PHP 5)</p><p class="refpurpose"><span class="refname">get_defined_vars</span> — <span class="dc-title"> Returns an array of all defined variables </span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">array</span> <span class="methodname"><b><b>get_defined_vars</b></b></span> ( <span class="methodparam">void</span> )</div> <p class="para rdfs-comment"> This function returns a multidimensional array containing a list of all defined variables, be them environment, server or user-defined variables, within the scope that <b>get_defined_vars()</b> is called. </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> A multidimensional array with all the variables. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>get_defined_vars()</b> Example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$b </span><span style="color: #007700">= array(</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">8</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$arr </span><span style="color: #007700">= </span><span style="color: #0000BB">get_defined_vars</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">// print $b<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"b"</span><span style="color: #007700">]);<br /><br /></span><span style="color: #FF8000">/* print path to the PHP interpreter (if used as a CGI)<br /> * e.g. /usr/local/bin/php */<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"_"</span><span style="color: #007700">];<br /><br /></span><span style="color: #FF8000">// print the command-line parameters if any<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"argv"</span><span style="color: #007700">]);<br /><br /></span><span style="color: #FF8000">// print all the server vars<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"_SERVER"</span><span style="color: #007700">]);<br /><br /></span><span style="color: #FF8000">// print all the available keys for the arrays of variables<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">array_keys</span><span style="color: #007700">(</span><span style="color: #0000BB">get_defined_vars</span><span style="color: #007700">()));<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5.0.0</td> <td colspan="1" rowspan="1" align="left"> The <var class="varname"><a href="reserved.variables.globals.html" class="classname">$GLOBALS</a></var> variable is included in the results of the array returned. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.isset.html" class="function" rel="rdfs-seeAlso">isset()</a></li> <li class="member"><a href="function.get-defined-functions.html" class="function" rel="rdfs-seeAlso">get_defined_functions()</a></li> <li class="member"><a href="function.get-defined-constants.html" class="function" rel="rdfs-seeAlso">get_defined_constants()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.floatval.html">floatval</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.get-resource-type.html">get_resource_type</a></div> <div class="up"><a href="ref.var.html">Variable handling Functions</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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