php数组按某一个键值排序

public function array_sort($array,$keys,$type='asc'){
        if(!isset($array) || !is_array($array) || empty($array)){
        return '';
        }
        if(!isset($keys) || trim($keys)==''){
        return '';
        }
        if(!isset($type) || $type=='' || !in_array(strtolower($type),array('asc','desc'))){
        return '';
        }
        $keysvalue=array();
        foreach($array as $key=>$val){
        $val[$keys] = str_replace('-','',$val[$keys]);
        $val[$keys] = str_replace(' ','',$val[$keys]);
        $val[$keys] = str_replace(':','',$val[$keys]);
        $keysvalue[] =$val[$keys];
        }
        asort($keysvalue); //key值排序
        reset($keysvalue); //指针重新指向数组第一个
        foreach($keysvalue as $key=>$vals) {
        $keysort[] = $key;
        }
        $keysvalue = array();
        $count=count($keysort);
        if(strtolower($type) != 'asc'){
        for($i=$count-1; $i>=0; $i--) {
        $keysvalue[] = $array[$keysort[$i]];
        }
        }else{
        for($i=0; $i<$count; $i++){
        $keysvalue[] = $array[$keysort[$i]];
        }
        }
        return $keysvalue;
    }