How to replace inner array in php? -

i have 1 array follows :

    array     (         [154541] => array             (                 **[3831211] => array                     (                         [34443] => 34443                         [34444] => 34444                         [34438] => 34438                         [34442] => 34442                         [34450] => 34450                     )**              )          [154514] => array             (                 **[3830597] => array                     (                         [34442] => 34442                         [34450] => 34450                         [34443] => 34443                         [34444] => 34444                         [34438] => 34438                     )**              )          [154477] => array             (                 **[3829564] => array                     (                         [34442] => 34442                         [34444] => 34444                         [34438] => 34438                         [34450] => 34450                         [34443] => 34443                     )**                  [3830046] => array                     (                         [34442] => 34442                         [34444] => 34444                         [34443] => 34443                         [34438] => 34438                         [34450] => 34450                     )              )          [154474] => array             (                 [3829402] => array                     (                         [34442] => 34442                         [34450] => 34450                         [34443] => 34443                         [34438] => 34438                         [34444] => 34444                     )              )          [154472] => array             (                 [3831553] => array                     (                         [34443] => 34443                         [34450] => 34450                         [34438] => 34438                         [34444] => 34444                         [34442] => 34442                     )                  [3829803] => array                     (                         [34443] => 34443                         [34444] => 34444                         [34450] => 34450                         [34442] => 34442                         [34438] => 34438                     )                  [3829802] => array                     (                         [34443] => 34443                         [34444] => 34444                         [34438] => 34438                         [34450] => 34450                         [34442] => 34442                     )                  [3831552] => array                     (                         [34444] => 34444                         [34450] => 34450                         [34443] => 34443                         [34442] => 34442                         [34438] => 34438                     )                  [3830078] => array                     (                         [34444] => 34444                         [34442] => 34442                         [34443] => 34443                         [34438] => 34438                         [34450] => 34450                     )              ) ) 

now want replace inner array(i have made inner array ** in above array) new generated array called $alerts.

i not getting how replace inner-array $alerts array.

this should trick.

$array[154541] = array("3831211" => $alerts); 

or if inner array has more elements:

$array[154541][3831211] = $newdata;