获取指定范围内最接近数

public function NextMiddleNumber($Number,$NumberRangeArray)
{
	$w = 0;
	$c = -1;
	$abstand = 0;
	$middle = ($Number['max']+$Number['min'])/2;
	$l = count($NumberRangeArray);
	for ($pos=0; $pos < $l; $pos++) {
		$n = $NumberRangeArray[$pos]['score'];
		$abstand = ($n > $middle) ? $middle - $n : $n - $middle;
		if ($c == -1) {
			$c = $abstand;
			continue;
		} else if ($abstand > $c) {
			$c = $abstand;
			$w = $pos;
		}
	}
	return $NumberRangeArray[$w];
}