Problem with Josn Data

I have recived a set of dat from an android device using Json. I have decoded this data into a PHP array. I took each value of the array usinf foreach and placed in a MySQL statement. But its not working. Can any body help me. Given below is my code.
[php] $array=$_POST[‘nuer’]; //numbers fetched

    $jstring = (array)json_decode($array);

    foreach($jstring  as $value ) //loop over values

     $four = mb_substr($value, 0,-10); //to get the first chara's
     $ten = mb_substr($value, -10); // to get the last ten chara

           $con=mysqli_connect("localhost","app","test","appt"); //connection to the database

       $result = mysqli_query($con, "SELECT * FROM profile WHERE (mobileno IN '$ten') AND (code IN '$four')");
           while($row = mysqli_fetch_array($result, MYSQL_ASSOC))

            $friend[] = $row[id];


$result is returning a null value. When i used a user defined array with random value, this code worked perfectly. Thanks in Advance.

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