共享一个PHP对二维数组的某个字段进行升降排序类

<?php/** * @author paul <199921128@qq.com> * @desc 对二维数组的某一个字段进行升降排序 * @data * $testData = array(array('newPrice'=>9),array('newPrice'=>21),array('newPrice'=>15),array('newPrice'=>13),array('newPrice'=>12)); */class sortClass{    //升序function sortArrayAsc($preData,$sortType='newPrice'){        $sortData = array();        foreach ($preData as $key_i => $value_i){            $price_i = $value_i[$sortType];            $min_key = '';            $sort_total = count($sortData);            foreach ($sortData as $key_j => $value_j){                if($price_i<$value_j[$sortType]){                    $min_key = $key_j+1;                    break;                }            }            if(empty($min_key)){                array_push($sortData, $value_i);             }else {                $sortData1 = array_slice($sortData, 0,$min_key-1);                 array_push($sortData1, $value_i);                if(($min_key-1)<$sort_total){                    $sortData2 = array_slice($sortData, $min_key-1);                     foreach ($sortData2 as $value){                        array_push($sortData1, $value);                    }                }                $sortData = $sortData1;            }        }        return $sortData;    }//降序function sortArrayDesc($preData,$sortType='newPrice'){        $sortData = array();        foreach ($preData as $key_i => $value_i){            $price_i = $value_i[$sortType];            $min_key = '';            $sort_total = count($sortData);            foreach ($sortData as $key_j => $value_j){                if($price_i>$value_j[$sortType]){                    $min_key = $key_j+1;                    break;                }            }            if(empty($min_key)){                array_push($sortData, $value_i);             }else {                $sortData1 = array_slice($sortData, 0,$min_key-1);                 array_push($sortData1, $value_i);                if(($min_key-1)<$sort_total){                    $sortData2 = array_slice($sortData, $min_key-1);                     foreach ($sortData2 as $value){                        array_push($sortData1, $value);                    }                }                $sortData = $sortData1;            }        }        return $sortData;    }}?>