冒泡排序

$data=[9,6,8,2,3,7,5,1,4];$tmp=null;for($i=0;$i<count($data);$i++){    for($j=0;$j<count($data)-1;$j++){        if($data[$j]>$data[$j+1]){            $tmp=$data[$j];            $data[$j]=$data[$j+1];            $data[$j+1]=$tmp;        }    }}print_r($data);