<?php
$kelime = $_GET['kelime']; 
$query = mysql_query("Select kelime From TABLOM where kelime=$kelime"); 

if(mysql_num_rows($query)==0)
mysql_query("Insert Into TABLOM (kelime) Values ('$kelime')"); 
?>

<?php
$kelime = $_GET['kelime'];
$sonuc = mysql_query("Select kelime From TABLOM where kelime=$kelime");
$satir=mysql_fetch_array($sonuc);
$db_kelime=$satir['kelime'];

if($db_kelime != $kelime){
mysql_query("Insert Into TABLOM (kelime) Values ('$kelime')");
}
?>

<?php
$kelime = $_GET['kelime'];
$sonuc = mysql_query("Select Count(kelime) From TABLOM where kelime=$kelime");
$sayi = mysql_result($sonuc,0);

if($sayi ==0){
mysql_query("Insert Into TABLOM (kelime) Values ('$kelime')");
}
?>