this is the final result! working perfect!
i know it looks much more complicated from what i ask :
Code:
$sqlSURVEY_AnsSUid=mysql_query("SELECT * FROM `xp_survey_answer` ")or die(mysql_error());
while ($rowSURVEY_Ans=mysql_fetch_array($sqlSURVEY_AnsSUid))
{
$ans_su_id[]=$rowSURVEY_Ans['ans_su_id'];
}
$str2 = implode(',',array_unique($ans_su_id));
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