<!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>Check DNS records corresponding to a given Internet host name or IP address</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ref.network.html">Network Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.closelog.html">closelog</a></div> <div class="up"><a href="ref.network.html">Network Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.checkdnsrr" class="refentry"> <div class="refnamediv"> <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> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; 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