Intersect unknown number of arrays in PHP

Question

I\'m trying to intersect an arbitrary number of PHP arrays, the count of which depends on a user provided parameter, each of which can have any number of elements.

F

Answer 1

Don't use eval()!

Try this

$isect = array();
for ($i = 1; $i <= $N; $i++) {
    $isect = array_intersect($isect, ${'array'.$i});
}

or that

$arrays = array()
for ($i = 1; $i <= $N; $i++) {
    $arrays[] = ${'array'.$i};
}
$isect = call_user_func_array('array_intersect', $arrays);