function.getenv.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>Gets the value of an environment variable</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.get-required-files.html">get_required_files</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.getlastmod.html">getlastmod</a></div> <div class="up"><a href="ref.info.html">PHP Options/Info Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.getenv" class="refentry"> <div class="refnamediv"> <h1 class="refname">getenv</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">getenv</span> — <span class="dc-title">Gets the value of an environment variable</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>getenv</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$varname</tt></span> )</div> <p class="para rdfs-comment"> Gets the value of an environment variable. </p> <p class="para"> You can see a list of all the environmental variables by using <a href="function.phpinfo.html" class="function">phpinfo()</a>. You can find out what many of them mean by taking a look at the <a href="http://hoohoo.ncsa.uiuc.edu/cgi/" class="link external">» CGI specification</a>, specifically the <a href="http://hoohoo.ncsa.uiuc.edu/cgi/env.html" class="link external">» page on environmental variables</a>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">varname</tt></i></span> <dd> <p class="para"> The variable name. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the value of the environment variable <i><tt class="parameter">varname</tt></i>, or <b><tt>FALSE</tt></b> on an error. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>getenv()</b> Example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Example use of getenv()<br /></span><span style="color: #0000BB">$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">getenv</span><span style="color: #007700">(</span><span style="color: #DD0000">'REMOTE_ADDR'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Or simply use a Superglobal ($_SERVER or $_ENV)<br /></span><span style="color: #0000BB">$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">$_SERVER</span><span style="color: #007700">[</span><span style="color: #DD0000">'REMOTE_ADDR'</span><span style="color: #007700">];<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.putenv.html" class="function" rel="rdfs-seeAlso">putenv()</a></li> <li class="member"><a href="function.apache-getenv.html" class="function" rel="rdfs-seeAlso">apache_getenv()</a></li> <li class="member"><a href="language.variables.superglobals.html" class="link">Superglobals</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.get-required-files.html">get_required_files</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.getlastmod.html">getlastmod</a></div> <div class="up"><a href="ref.info.html">PHP Options/Info 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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