Source of: /manual/en/function.get-defined-vars.php
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<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>
<a name="function.get-defined-vars.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">array</span> <span class="methodname"><b>get_defined_vars</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>
<a name="function.get-defined-vars.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
A multidimensional array with all the variables.
</p>
</div>
<a name="function.get-defined-vars.examples"></a><div class="refsect1 examples">
<h3 class="title">Examples</h3>
<p class="para">
</p><div class="example">
<p><b>Example #1 <b>get_defined_vars()</b> Example</b></p>
<div class="example-contents programlisting">
<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">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"_SERVER"</span><span style="color: #007700">]);<br /><br /></span><span style="color: #FF8000">// print all the available keys for the arrays of variables<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">array_keys</span><span style="color: #007700">(</span><span style="color: #0000BB">get_defined_vars</span><span style="color: #007700">()));<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div><p>
</p>
</div>
<a name="function.get-defined-vars.changelog"></a><div class="refsect1 changelog">
<h3 class="title">Changelog</h3>
<p class="para">
</p><table class="doctable informaltable">
<thead valign="middle">
<tr valign="middle">
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody valign="middle" class="tbody">
<tr valign="middle">
<td align="left">5.0.0</td>
<td align="left">
The <var class="varname"><a href="reserved.variables.globals.php" class="classname">$GLOBALS</a></var> variable is included in the results of
the array returned.
</td>
</tr>
</tbody>
</table>
<p>
</p>
</div>
<a name="function.get-defined-vars.seealso"></a><div class="refsect1 seealso">
<h3 class="title">See Also</h3>
<p class="para">
</p><ul class="simplelist">
<li class="member"><a href="function.isset.php" class="function" rel="rdfs-seeAlso">isset()</a> - Determine if a variable is set and is not NULL</li>
<li class="member"><a href="function.get-defined-functions.php" class="function" rel="rdfs-seeAlso">get_defined_functions()</a> - Returns an array of all defined functions</li>
<li class="member"><a href="function.get-defined-constants.php" class="function" rel="rdfs-seeAlso">get_defined_constants()</a> - Returns an associative array with the names of all the constants and their values</li>
</ul><p>
</p>
</div>
</div><?php manual_footer(); ?>
