如何获得数组总和

Question

I have 2 arrays.

$fruits = [
    'mango' => 20,
    'apple' => 30,
    'orange' => 10,
    'banana' => 5,
];

$purchased = ['mango','banana'];

How do I get the sum of the values on the $fruits array that are only available on the $purchased array? That is get the sum = 25

Answer 1

Try a loop -

$sum = 0;
foreach($purchased as $v) {
   $sum += (!empty($fruits[$v]) ? $fruits[$v] : 0); 
}