Question

I’ve got the following 2D array, stored inside the array variable $my_array

Array 
( 
[0] => Array 
       ( 
         [0] => 3 
         [1] => 6 
         [2] => 3 
       ) 
[1] => Array 
       ( 
         [0] => 3 
         [1] => 6 
         [2] => 3 
       ) 
[2] => Array 
       ( 
         [0] => 3 
         [1] => 6 
         [2] => 3 
         ) 
)

I wanted to decrement all the [1] sub array values by 3. Tried the following code, with no success.

   $my_array[$i]['1']=($my_array[$i]['1'])-3;
   print_r($my_array);

Ideas?

Answer 1

foreach ($my_array as &$val) {
   $val[1] -= 3
}