我如何匹配输入类型值和mysql数据库行值

Question

我如何匹配输入类型值和mysql数据库行值？如果两个值都不应该相互匹配，那么echo A Message？

主页

   $(function() {
   $( "#textname" ).autocomplete({
   source: "data.php",
   minLength: 1
   });
   });
   </script>


   <div class="ui-widget">
   <label for="Name">Name: </label>
   <input id="textname" class="textname"/>
   </div>

数据页

<?php
$conn = mysql_connect("localhost", "root", "")  or die(mysql_error());
mysql_select_db("edgesoft", $conn) or die(mysql_error());
$q = strtolower($_GET["term"]);

$return = array();
$query = mysql_query("select * from customers where cname like '%$q%'") or die(mysql_error());
while ($row = mysql_fetch_array($query)) {
array_push($return,array('label'=>$row['cname'],'value'=>$row['cname']));
}

echo(json_encode($return));

if(json_encode($return))
{
echo "test";    
}
?>