php - Combine flags in array to single value using bitwise OR

Question

If I have an array of flags and I want to combine them with a bitwise conjunction

ie:

$foo = array(flag1, flag2);

into

$bar = flag1 | flag2;

Does PHP have any good functions that will do this nicely for me already?

Answer 1

The array_reduce will reduce an array to a single value for you:

$res = array_reduce($array, function($a, $b) { return $a | $b; }, 0);

Reduce is also sometimes called fold (fold left or fold right) in other languages.