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<title>Start XHProf profiling in sampling mode</title>
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<h1 class="refname">xhprof_sample_enable</h1>
<p class="verinfo">(PECL xhprof >= 0.9.0)</p><p class="refpurpose"><span class="refname">xhprof_sample_enable</span> — <span class="dc-title">Start XHProf profiling in sampling mode</span></p>
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<div class="refsect1 description" id="refsect1-function.xhprof-sample-enable-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>xhprof_sample_enable</strong></span>
( <span class="methodparam">void</span>
)</div>
<p class="para rdfs-comment">
Starts profiling in sample mode, which is a lighter weight version
of <span class="function"><a href="function.xhprof-enable.html" class="function">xhprof_enable()</a></span>. The sampling interval is
0.1 seconds, and samples record the full function call stack. The
main use case is when lower overhead is required when doing
performance monitoring and diagnostics.
</p>
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<div class="refsect1 parameters" id="refsect1-function.xhprof-sample-enable-parameters">
<h3 class="title">Parameters</h3>
<p class="para">This function has no parameters.</p>
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<div class="refsect1 returnvalues" id="refsect1-function.xhprof-sample-enable-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
<strong><code>NULL</code></strong>
</p>
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<div class="refsect1 seealso" id="refsect1-function.xhprof-sample-enable-seealso">
<h3 class="title">See Also</h3>
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.xhprof-sample-disable.html" class="function" rel="rdfs-seeAlso">xhprof_sample_disable()</a> - Stops xhprof sample profiler</span></li>
<li class="member"> <span class="function"><a href="function.xhprof-enable.html" class="function" rel="rdfs-seeAlso">xhprof_enable()</a> - Start xhprof profiler</span></li>
<li class="member"> <span class="function"><a href="function.memory-get-usage.html" class="function" rel="rdfs-seeAlso">memory_get_usage()</a> - Returns the amount of memory allocated to PHP</span></li>
<li class="member"> <span class="function"><a href="function.getrusage.html" class="function" rel="rdfs-seeAlso">getrusage()</a> - Gets the current resource usages</span></li>
</ul>
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