PHP

php sum array key

$names=array(
	array("name"=>"taylor","age"=>35),
 	array("name"=>"susan","age"=>30),
);
array_sum(array_column($names, 'age')); //65

PHP sum array values by key

$sumArray = array();

foreach ($myArray as $k=>$subArray) {
  foreach ($subArray as $id=>$value) {
    $sumArray[$id]+=$value;
  }
}

print_r($sumArray);