Change specific keys of multidimensional array in PHP -

i have 2 dimensional array called $array. after question here, know how change whole child array 2 dimensional array this:

code

$keys = array(0, 1);       foreach ($keys $key) {        foreach ($array[$key] $key2 => $value) {             $array[$key][$key2] = str_replace($stamm, $stamm2, $value);         }     }  

how possible change $array[0][3],$array[0][4] , $array[1]?

$array use $stamm + ending of verb time example "ons". have change cases root of verb ($stamm).
code above works change whole array[0] , array[1]. .

why dont

$array[0][3] = //your value; $array[0][4] =  //your value;   

and if want change value of $array[1]:

foreach ($array[1] $key => $value) {         $array[1][$key] = //your value;     }   

edit foreach :

foreach ($keys $key) {    foreach ($array[$key] $key2 => $value) {        if(($key==0 && ($key2 == 3 || $key2 == 4)) || ($key == 1) )            $array[$key][$key2] = //your value;     } }