Element 099-PHP output two dimensional array

<? PHP
     $ STU = Array ( Array (76,87,68),
                 Array (65,89,95),
                 Array (90,80,66),
                 Array (90,95,65));         // define a two dimensional array 
    echo 'a first element of an array element of the array STU $:'. $ STU [0] [0];         // specified elements in the array access 
    echo of '<br /> $ stu array the second element of the array elements is 2: '. $ STU [. 1] [. 1 ;]
     echo third element of the third array element <br /> $ stu array is':'. $ STU [2 ] [2 ];
 ?>