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<title>Returns an array of all defined variables</title>
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<h1 class="refname">get_defined_vars</h1>
<p class="verinfo">(PHP 4 >= 4.0.4, PHP 5, PHP 7)</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" id="refsect1-function.get-defined-vars-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">array</span> <span class="methodname"><strong>get_defined_vars</strong></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 <span class="function"><strong>get_defined_vars()</strong></span> is
called.
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.get-defined-vars-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
A multidimensional array with all the variables.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.get-defined-vars-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-6491">
<p><strong>Example #1 <span class="function"><strong>get_defined_vars()</strong></span> Example</strong></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 seealso" id="refsect1-function.get-defined-vars-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"><span class="function"><a href="function.isset.html" class="function" rel="rdfs-seeAlso">isset()</a> - Determine if a variable is set and is not NULL</span></li>
<li class="member"><span class="function"><a href="function.get-defined-functions.html" class="function" rel="rdfs-seeAlso">get_defined_functions()</a> - Returns an array of all defined functions</span></li>
<li class="member"><span class="function"><a href="function.get-defined-constants.html" class="function" rel="rdfs-seeAlso">get_defined_constants()</a> - Returns an associative array with the names of all the constants and their values</span></li>
</ul>
</p>
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