Find number which is greater than or equal to N in an array

Question

If I have a PHP array:

$array

With values:

45,41,40,39,37,31

And I have a variable:

$numb         


        

Answer 1

You could use array_reduce for this, which makes it more functional programming style:

function closest($needle, $haystack) {
    return array_reduce($haystack, function($a, $b) use ($needle) {
        return abs($needle-$a) < abs($needle-$b) ? $a : $b;
    });
}

For the rest, this follows the same principle as the other O(n) solutions.