Array intersect

Php get intersection of two arrays

$array1 = [1, 2];
$array2 = [2, 3, 4];
$commonValue = array_intersect($array1, $array2);
//$commonValue = 2
// If you have X number of arrays you can do:
$array1 = [1, 2];
$array2 = [2, 3, 4];
$arrayOfArrays = [$array1, $array2];
$commonValue = array_intersect(...$arrayOfArrays);

Array intersect

array_intersect(array $array, array ...$arrays): array

/* Returns an array containing all of the values in array whose 
   values exist in all of the parameters. */

Source: php.net

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