Checking to see if one array's elements are in another array in PHP

You can use array_intersect().

$result = !empty(array_intersect($people, $criminals));

There's little wrong with using array_intersect() and count() (instead of empty).

For example:

$bFound = (count(array_intersect($criminals, $people))) ? true : false;

if 'empty' is not the best choice, what about this:

if (array_intersect($people, $criminals)) {...} //when found

if (!array_intersect($people, $criminals)) {...} //when not found

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