If Statement dowsnt worke

i am trying to fetch some record and i wanted to check if previous id was equal to current id then echo something but for the second time the second if doesn't work ! and its just retrieve just one record !

$result= mysql_query    (" SELECT * FROM (( SELECT * FROM ((SELECT post_id FROM er_postmeta WHERE meta_key = 'app' AND meta_value = '1' ) po) INNER JOIN er_posts me ON po.post_id = me.ID AND me.post_status='publish') po2 ) INNER JOIN er_postmeta me2 ON po2.ID = me2.post_id ")
or die(mysql_error());  

    $arr_post_title="";
    $arr_post_type="";
    $arr_ID="";
$temp=array();
$row2 = mysql_fetch_assoc($result);
$temp1=$row2['ID'];


    while ($row = mysql_fetch_assoc($result)) {
            if($row['ID']==$temp1)
                {
                        $arr_ID=$row['ID'];
                        $arr_post_type=$row['post_type'];
                        $arr_post_title=$row['post_title'];


                    }

        if ($row['ID'] != $temp1)
            {
                    echo "{";
                    echo '"' . "ID".'"'. ":" .'"'.$arr_ID.'"'."," ;
                    echo '"' . "Post_Type".'"'. ":" .'"'.$arr_post_type.'"'."," ;
                    echo '"' . "Post_Title".'"'. ":" .'"'.$arr_post_title.'"'."," ; 
                    echo "},";
                    $temp1=$row['ID'];
            }

    }