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// form<form action="tld-check.php" method="post" id="check">  <input type="text" name="domain" size="18">   <select name="tld" size="1">     <option value="com" selected>com</option>     <option value="net">net</option>     <option value="org">org</option>     <option value="org">biz</option>  </select></form>// $domain var	$domain = $_REQUEST['domain'] . '.' . $_REQUEST['tld'];