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

Here's a smaller function that will also return the closest value. Helpful if you don't want to sort the array (to preserve keys).

function closest($array, $number) {
    //does an exact match exist?
    if ($i=array_search($number, $array)) return $i;

    //find closest
    foreach ($array as $match) {
        $diff = abs($number-$match); //get absolute value of difference
        if (!isset($closeness) || (isset($closeness) && $closeness>$diff)) {
            $closeness = $diff;
            $closest = $match;
        }
    }
    return $closest;
}