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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.1 $ -->
<refentry id='function.tld_check'>
<refnamediv>
<refname>tld_check</refname>
<refpurpose>
Verify TLD character restriction conformance
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>string</type><methodname>tld_check</methodname>
<methodparam><type>string</type><parameter>string</parameter></methodparam>
<methodparam><type>int</type><parameter>errpos</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>charset</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>tld</parameter></methodparam>
</methodsynopsis>
<para>
Checks whether or not <parameter>string</parameter> conforms to the restrictions on the sets
of valid characters defined by TLD authorities around the World. Treats
<parameter>string</parameter> as a hostname if <parameter>tld</parameter> is not present, determining the TLD
from the hostname. If <parameter>tld</parameter> is present, uses the restrictions defined
by the parties responsible for TLD <parameter>tld</parameter>. <parameter>charset</parameter> may be used to
specify the character set the <parameter>string</parameter> is in. Should an invalid character
be detected, returns FALSE and the 0-based position of the offending character
in reference <parameter>errpos</parameter>. In case of other failure conditions, <parameter>errpos</parameter> is not touched,
and NULL is returned. Should <parameter>string</parameter> conform to the TLD restrictions,
TRUE is returned.
</para>
<para>
<function>tld_check</function> returns TRUE, FALSE or NULL.
<example>
<title>An example</title>
<programlisting role="php">
<![CDATA[
<?php
echo tld_check('php.se', &$errpos, 'ISO-8859-1');
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
</refentry>
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