php - getting the sum of values from multidimensional array -

i need in getting sum of values of array, tried research on how solved end getting errors in using array_sum() end in array_sum expects 1 parameter array, , tried $value3+=$value3 , having result not correct, way here code:

var_export($_post['guests']); echo "<br />"; foreach($_post['guests'] $key1 => $value1){     foreach($value1 $key2 => $value2){         foreach($value2 $value3){          }      }     echo "room type: " . $key1 . " no. of rooms: " . $key2 . " no. of guest: " . array_sum($value3) . "<br /> ";  } 

and here result of this:

array ( 1 => array ( 2 => array ( 0 => '1', 1 => '2', ), ), 2 => array ( 1 => array ( 0 => '4', ), ), ) 

warning: array_sum() expects parameter 1 array, string given in c:\xampp\htdocs\nation\reservation-form3.php on line 14 room type: 1 no. of rooms: 2 no. of guest:

warning: array_sum() expects parameter 1 array, string given in c:\xampp\htdocs\nation\reservation-form3.php on line 14 room type: 2 no. of rooms: 1 no. of guest:

i think want so

   $_post['guests'] = array (     // roomtype => ( roomnum => ( guestlist     // though don't understand why guests in room array    // no. of room can't 0 :)     1 => array ( 2 => array ( 0 => '1', 1 => '2', ), ),     2 => array ( 1 => array ( 0 => '4', ), ), );  echo "<br />"; foreach($_post['guests'] $key1 => $value1)          // loop roomtype     foreach($value1 $key2 => $value2)      // loop roomnum       echo "room type: " . $key1 .             " no. of rooms: " . $key2 .             " no. of guest: " . array_sum($value2) . "<br />"; 

result

<br /> room type: 1 no. of rooms: 2 no. of guest: 3<br /> room type: 2 no. of rooms: 1 no. of guest: 4<br />