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<title>Check DNS records corresponding to a given Internet host name or IP address</title>
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<h1 class="refname">checkdnsrr</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">checkdnsrr</span> — <span class="dc-title">Check DNS records corresponding to a given Internet host name or IP address</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.checkdnsrr-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>checkdnsrr</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$host</code></span>
[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$type</code><span class="initializer"> = "MX"</span></span>
] )</div>
<p class="para rdfs-comment">
Searches DNS for records of type <em><code class="parameter">type</code></em>
corresponding to <em><code class="parameter">host</code></em>.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.checkdnsrr-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">host</code></em></span>
<dd>
<p class="para">
<em><code class="parameter">host</code></em> may either be the IP address in
dotted-quad notation or the host name.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">type</code></em></span>
<dd>
<p class="para">
<em><code class="parameter">type</code></em> may be any one of: A, MX, NS, SOA,
PTR, CNAME, AAAA, A6, SRV, NAPTR, TXT or ANY.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.checkdnsrr-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> if any records are found; returns <strong><code>FALSE</code></strong> if no records
were found or if an error occurred.
</p>
</div>
<div class="refsect1 changelog" id="refsect1-function.checkdnsrr-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>5.3.0</td>
<td>
This function is now available on Windows platforms.
</td>
</tr>
<tr>
<td>5.2.4</td>
<td>
TXT <em><code class="parameter">type</code></em> was added.
</td>
</tr>
<tr>
<td>5.0.0</td>
<td>
AAAA <em><code class="parameter">type</code></em> was added.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 notes" id="refsect1-function.checkdnsrr-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
For compatibility with Windows before this was implemented, then try the
<a href="http://pear.php.net/" class="link external">» PEAR</a> class
<a href="http://pear.php.net/package/Net_DNS" class="link external">» Net_DNS</a>.
</p>
</p></blockquote>
</div>
<div class="refsect1 seealso" id="refsect1-function.checkdnsrr-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.dns-get-record.html" class="function" rel="rdfs-seeAlso">dns_get_record()</a> - Fetch DNS Resource Records associated with a hostname</span></li>
<li class="member"> <span class="function"><a href="function.getmxrr.html" class="function" rel="rdfs-seeAlso">getmxrr()</a> - Get MX records corresponding to a given Internet host name</span></li>
<li class="member"> <span class="function"><a href="function.gethostbyaddr.html" class="function" rel="rdfs-seeAlso">gethostbyaddr()</a> - Get the Internet host name corresponding to a given IP address</span></li>
<li class="member"> <span class="function"><a href="function.gethostbyname.html" class="function" rel="rdfs-seeAlso">gethostbyname()</a> - Get the IPv4 address corresponding to a given Internet host name</span></li>
<li class="member"> <span class="function"><a href="function.gethostbynamel.html" class="function" rel="rdfs-seeAlso">gethostbynamel()</a> - Get a list of IPv4 addresses corresponding to a given Internet host
name</span></li>
<li class="member">the named(8) manual page</li>
</ul>
</p>
</div>
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