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Sum keyed elements of an array

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Sum all elements of a bidimensional or multi-dimensional array with an assigned key

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  1. /**
  2.  * sum values in array
  3.  *
  4.  * @param array $arr
  5.  * @param string [optional]$index
  6.  * @return int result
  7.  */
  8. function array_sum_key( $arr, $index = null ){
  9.     if(!is_array( $arr ) || sizeof( $arr ) < 1){
  10.         return 0;
  11.     }
  12.     $ret = 0;
  13.     foreach( $arr as $id => $data ){
  14.         if( isset( $index )  ){
  15.             $ret += (isset( $data[$index] )) ? $data[$index] : 0;
  16.         }else{
  17.             $ret += $data;
  18.         }
  19.     }
  20.     return $ret;
  21. }
  22.  
  23. //## To sum elements on a multidimensional finding defined key = 'pv' array
  24.  
  25. $sum = 0;
  26. $array_obj = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
  27. foreach($array_obj as $key => $value) {
  28.     if($key == 'pv')
  29.         $sum += $value;
  30. }
  31. echo $sum;

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