How can array_intersect_key and array_flip be utilized to sum only certain values in PHP arrays?

To sum only certain values in PHP arrays, you can use the array_intersect_key function to filter out the keys you want to include in the sum, and then use array_flip to swap the keys with their values. This way, you can easily sum only the selected values in the array. 

// Sample arrays
$array1 = ['a' => 10, 'b' => 20, 'c' => 30];
$array2 = ['b' => 5, 'c' => 10, 'd' => 15];

// Keys to sum
$keys = ['a', 'c'];

// Filter out keys and flip array
$filteredArray = array_intersect_key($array1, array_flip($keys));

// Calculate sum of selected values
$sum = array_sum($filteredArray);

echo $sum; // Output: 40 (10 + 30)

Keywords

array_intersect_key array_flip sum PHP arrays values

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