Php 在多维数组中使用重复值对数组进行分组

我从mysql数据库中查询了这个数组格式。我查询的数据有一些重复，所以我删除了重复的数据。结果查询的数组格式如下所示

[0] => a
[1] => b


[2] => Array
    (
        [ch] => a
        [op] => 1
        [in] => 2012-12-20 09:28:53
    )

[3] => Array
    (
        [ch] => b
        [op] => 2
        [in] => 2012-12-20 19:44:10
    )


[4] => Array
    (
        [ch] => a
        [op] => 1000
        [in] => 2012-12-23 18:21:40
    )

[5] => Array
    (
        [ch] => b
        [op] => 1000
        [in] => 2012-12-23 18:26:16
    )



[6] => Array
    (
        [ch] => a
        [op] => 1000
        [in] => 2012-12-24 12:10:55
    )

如何使用其中一个值作为键输出这种数组

[a] => array(
[op] => 1000
[in] => 2012-12-24 12:10:55
      ),
Array
(
[op] => 1000
[in] => 2012-12-23 18:21:40
    )
[b]=> Array
    (
        [op] => 1000
        [in] => 2012-12-23 18:26:16
    )

---

等等。

标记您正在使用的语言…

php

，

java

…等等

simply use array_push function,first define a blank array and grt value in it using array_push
eg.
$final_arr=array();
data=mysql_fetch_assoc($query);
array_push($final_arr,$data);