<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Gets the value of an environment variable</title> </head> <body><div class="manualnavbar" 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" id="refsect1-function.getenv-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><strong>getenv</strong></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$varname</code></span> )</div> <p class="para rdfs-comment"> Gets the value of an environment variable. </p> <p class="para"> You can see a list of all the environmental variables by using <span class="function"><a href="function.phpinfo.html" class="function">phpinfo()</a></span>. Many of these variables are listed within <a href="http://www.faqs.org/rfcs/rfc3875" class="link external">» RFC 3875</a>, specifically section 4.1, "Request Meta-Variables". </p> </div> <div class="refsect1 parameters" id="refsect1-function.getenv-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter">varname</code></em></span> <dd> <p class="para"> The variable name. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.getenv-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the value of the environment variable <em><code class="parameter">varname</code></em>, or <strong><code>FALSE</code></strong> if the environment variable <em><code class="parameter">varname</code></em> does not exist. </p> </div> <div class="refsect1 examples" id="refsect1-function.getenv-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-493"> <p><strong>Example #1 <span class="function"><strong>getenv()</strong></span> Example</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Example use of getenv()<br /></span><span style="color: #0000BB">$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" id="refsect1-function.getenv-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"> <span class="function"><a href="function.putenv.html" class="function" rel="rdfs-seeAlso">putenv()</a> - Sets the value of an environment variable</span></li> <li class="member"> <span class="function"><a href="function.apache-getenv.html" class="function" rel="rdfs-seeAlso">apache_getenv()</a> - Get an Apache subprocess_env variable</span></li> <li class="member"><a href="language.variables.superglobals.html" class="link">Superglobals</a></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" 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>