PHP实现冒泡排序
09/01
# PHP对某个数组进行排序
PHP中需要用到对某个数组进行排序，一般使用的就是冒泡排序了，直接上代码，下面演示的是从低到高排序，也可以新增参数DESC变成从高到低排序
排序函数
/**
* 数组冒泡排序
* @param $arr 排序的数据
* @param string $keySort 是否有对应的下标对比，关联数组使用
* @param string $type 排序类型 ASC:从低到高，DESC:从高到低,大小写敏感
* @return mixed
*/
function maopao($arr, $keySort = '', $type = 'ASC')
{
$len = count($arr);
$n = $len - 1;
for ($i = 0; $i < $len; $i++) {
for ($j = 0; $j < $n; $j++) {
//当前值大于下个值
$data1 = $keySort ? $arr[$j][$keySort] : $arr[$j];
$data2 = $keySort ? $arr[$j + 1][$keySort] : $arr[$j + 1];
switch ($type) {
case 'ASC': //从小到大排序
if ($data1 > $data2) {
//如果当前的值大于下一个值，放到一个临时数组里
$tmpVal = $arr[$j];
//把下一个值替换当前的值
$arr[$j] = $arr[$j + 1];
//把当前值替换下一个值 ，即两个位置互换
$arr[$j + 1] = $tmpVal;
}
break;
case 'DESC': //从大到小排序
//当前值小于下个值
if ($data1 < $data2) {
//当前值放到临时数组
$tmpVal = $arr[$j];
//把当前值替换成下个
$arr[$j] = $arr[$j + 1];
//下个值替换成当前值，位置互换
$arr[$j + 1] = $tmpVal;
}
break;
}
}
}
return $arr;
}
使用方法
//关联数组
$sortArr = [
[
'id' => 1,
'count' => 10,
'name' => '123'
],
[
'id' => 2,
'count' => 4,
'name' => '4'
],
[
'id' => 3,
'count' => 2,
'name' => '2'
],
[
'id' => 4,
'count' => 5,
'name' => '10'
],
[
'id' => 5,
'count' => 2,
'name' => '11'
],
];
//按照count，从低到高排序
$res1 = maopao($sortArr,'count');
//$res1的结果
/*
Array
(
[0] => Array
(
[id] => 3
[count] => 2
[name] => 2
)
[1] => Array
(
[id] => 5
[count] => 2
[name] => 11
)
[2] => Array
(
[id] => 2
[count] => 4
[name] => 4
)
[3] => Array
(
[id] => 4
[count] => 5
[name] => 10
)
[4] => Array
(
[id] => 1
[count] => 10
[name] => 123
)
);
*/
//按照count，从高到低排序
$res2 = maopao($sortArr,'count','DESC');
//$res2的结果
/*
Array
(
[0] => Array
(
[id] => 1
[count] => 10
[name] => 123
)
[1] => Array
(
[id] => 4
[count] => 5
[name] => 10
)
[2] => Array
(
[id] => 2
[count] => 4
[name] => 4
)
[3] => Array
(
[id] => 3
[count] => 2
[name] => 2
)
[4] => Array
(
[id] => 5
[count] => 2
[name] => 11
)
)
*/
//索引数组
$randArr = [10,3,1,90,21,4,6,8,5];
//从低至高排序
$res3 = maopao($randArr);
$res3的结果
/*
Array
(
[0] => 1
[1] => 3
[2] => 4
[3] => 5
[4] => 6
[5] => 8
[6] => 10
[7] => 21
[8] => 90
)
*/
//从高至低排序
$res4 = maopao($randArr,'','DESC');
$res4的结果
/*
Array
(
[0] => 90
[1] => 21
[2] => 10
[3] => 8
[4] => 6
[5] => 5
[6] => 4
[7] => 3
[8] => 1
)
*/PHP对某个数组进行排序的方法，可以拿来直接使用！
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