Somma di alcuni valori in un array

[leonapster]

Allora, ti stampo il var_dump dell'array

array(9) {
[0]=> array(3) { ["room"]=> string(3) "842" ["treatment_type"]=> string(1) "1" ["price"]=> int(420) }
[1]=> array(3) { ["room"]=> string(3) "842" ["treatment_type"]=> string(1) "2" ["price"]=> int(560) }
[2]=> array(3) { ["room"]=> string(3) "843" ["treatment_type"]=> string(1) "2" ["price"]=> int(630) }
[3]=> array(3) { ["room"]=> string(3) "842" ["treatment_type"]=> string(1) "1" ["price"]=> int(70) }
[4]=> array(3) { ["room"]=> string(3) "842" ["treatment_type"]=> string(1) "2" ["price"]=> int(90) }
[5]=> array(3) { ["room"]=> string(3) "843" ["treatment_type"]=> string(1) "2" ["price"]=> int(100) }
[6]=> array(3) { ["room"]=> string(3) "843" ["treatment_type"]=> string(1) "2" ["price"]=> int(100) }
[7]=> array(3) { ["room"]=> string(3) "842" ["treatment_type"]=> string(1) "1" ["price"]=> int(70) }
[8]=> array(3) { ["room"]=> string(3) "842" ["treatment_type"]=> string(1) "2" ["price"]=> int(90) }
}

e mi stampa

Array (
[842] =>
Array ( [1] => 560
[2] => 740 )

[843] => Array (
[2] => 830 )
)