How can I add values of key 2 of inner arrays for the similar values of key 0 of inner arrays.

Thanks for your help i’m stuck on this problem. Let me explain it, i have this kind of array. The value of key0 in first 3 arrays is same i.e. 10002, so sum key2 of those 3 arrays.

  array (size=6)   0 =>      array (size=4)       0 => float 10002       1 => string 'xxxyyyy' (length=7)       2 => float 5.00       3 => float 0   1 =>      array (size=4)       0 => float 10002       1 => string 'xxxyyyy' (length=7)       2 => float 5.00       3 => float 4.25   2 =>      array (size=4)       0 => float 10002       1 => string 'xxxyyyy' (length=7)       2 => float 5.00       3 => float 0   3 =>      array (size=4)       0 => float 10010       1 => string 'yyyyyyy' (length=7)       2 => float 10.00       3 => float 0   4 =>      array (size=4)       0 => float 10010       1 => string 'yyyyyyy' (length=7)       2 => float 10.00       3 => float 1.85   5 =>      array (size=4)       0 => float 10010       1 => string 'yyyyyyy' (length=7)       2 => float 10.00       3 => float 0 

Is it possible to get this result (if key0 values are same of inner arrays then sum key2 values )

sum_key_2 = 15, for key_0 = 10002 //key 0 value is similar in first 3 arrays so add key 2 values of those 3 arrays sum_key_2 = 30, for key_0 = 10010 

I tried this but not getting desired output:

$  bill = 0; $  sp_no = array(); foreach($  data as $  innerKey => $  innerArray) {   $  sp_no[] = $  innerArray[0]; }  foreach($  data as $  k => $  val) {   if ($  sp_no[$  k] == $  val[0]) {     $  bill += $  val[2];   } } echo $  bill;