MySQL多行結果合併為一行

在做乙個專案的使用者列表的時候，需要將乙個使用者的多輛車放在一行顯示，但是普通查詢出來的結果是：

array
([0] => array
([id] => 29
[user_id] => 1
[car_no] => 234567
)[1] => array
([id] => 21
[user_id] => 1
[car_no] => 23565
)[2] => array
([id] => 23
[user_id] => 1
[car_no] => 12345
)[3] => array
([id] => 28
[user_id] => 1
[car_no] => 124455
)[4] => array
([id] => 6
[user_id] => 1
[car_no] => 12345
)[5] => array
([id] => 7
[user_id] => 2
[car_no] => 22
)[6] => array
([id] => 3
[user_id] => 2
[car_no] => 粵t863
)[7] => array
([id] => 25
[user_id] => 3
[car_no] => 12345
));

但是我們想要的結果是：

array(
[0] => array
([user_id] => 8
[login] => 18620982882
[car_no] => array
([0] => 粵a123))
[1] => array
([user_id] => 7
[login] => 
[car_no] => array
([0] => 粵t456
[1] => 123456))
[2] => array
([user_id] => 2
[login] => 13318029123
[car_no] => array
([0] => 粵t863
[1] => 22))
[3] => array
([user_id] => 1
[login] => 15088138542
[car_no] => array
([0] => 12345
[1] => 23565
[2] => 12345
[3] => 124455
[4] => 234567))
)

我之前的方法是：

private function group_sort($unique, $num, $data) }}
return $data_format;
}

乙個乙個遍歷，進行重組聚合，也可以到到效果，但是效率低下，**也比較複雜，今天查閱資料發現乙個簡單的方法，mysql本身有這個功能，可以把多個結果集成為一行，預設用逗號隔開，sql語句如下：

select user_id,group_concat(car_no) as car_no from mf_car_info group by user_id;

產生的結果：

array
(    [0] => array
([user_id] => 1
[car_no] => 12345,23565,12345,124455,234567
)[1] => array
([user_id] => 2
[car_no] => 粵t863,22
)[2] => array
([user_id] => 3
[car_no] => sdfa,12345
)

這個就簡單多了，直接遍歷分割一下即可：

foreach ($data as $key => $value) 
echo "";
print_r(json_encode($data));
echo "

";

完整**如下：

<?php
$dsn = 'mysql:dbname=***x;host=192.***.1.***;port=3306';
$username = 'ysp';
$password = '123456';
try  catch (pdoexception $e) 
$statement = "select id,user_id,group_concat(car_no) as car_no from mf_car_info group by user_id";
$rows = $pdo->query($statement);
//獲取總行數
// print_r($rows->rowcount());
//獲取所有結果
$data = $rows->fetchall();
foreach ($data as $key => $value) 
echo "";
print_r(json_encode($data));
echo "

";

exit;

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