php - How to get value from multidimensional array value -

    array (     [updatecategories] => array         (             [products] => array                 (                     [0] => array                         (                             [cat_id] => 3                             [position] => 2                             [product_id] => 8                         )                      [1] => array                         (                             [cat_id] => 4                             [position] => 11                             [product_id] => 8                         )                      [2] => array                         (                             [cat_id] => 3                             [position] => 4                             [product_id] => 39                         )                      [3] => array                         (                             [cat_id] => 4                             [position] => 9                             [product_id] => 8                         )                      [4] => array                         (                             [cat_id] => 3                             [position] => 6                             [product_id] => 41                         )                      [5] => array                         (                             [cat_id] => 11                             [position] => 7                             [product_id] => 8                         ) 

the above array output array need cat_id of product_id=8. how can this?

$newarr = array(); foreach( $arr['updatecategories']['products'] $myarr) {   if($myarr['product_id'] == 8)   $newarr[] =  $myarr['cat_id']; }