数组减少变量中的返回布尔值

Question

How I can return boolean type in variable? I have code:

$imageRes = array_reduce(['image', 'image1', 'image2'], function ($carry) {
    return in_array($carry, ['image1', 'image2']);
});

I need return in imageRes a boolean type: true/false, if one of the elements in ['image1', 'image2'] is in ['image', 'image1', 'image2']. How I can do it?

Answer 1

Use array_intersect() instead of array_reduce(), count the result of that and cast it to a boolean. If there are no intersections, the count() will be zero, thus a boolean false. If there are at least one value intersecting, the count() will be greater than one and any non-zero number cast to a boolean will be true.

$imageRes = (bool)count(array_intersect(['image1', 'image2'], ['image', 'image1', 'image2']));

Output:

bool(true)

• Live demo at https://3v4l.org/0INUP
• PHP.net on array_intersect()