//商家的等级信息是一个二维数组,求出最小折扣和最大折扣
array(0=>array('levelname'=>'银','dis'=>7.5), 1=>array('levelname'=>'金卡','dis'=>8.0), 2=>array('levelname'=>'白金卡','dis'=>9.0));
function getMinAndMaxInArray($arr) {if(empty($arr)) {return array(10,10);}$disArr = array();foreach($arr as $value) {$disArr[] = floatval($value['dis']);}sort($disArr);$resArr = !empty($disArr) ? array($disArr[0],$disArr[count($disArr)-1]) : array(10,10);unset($disArr);return $resArr;}