在多维数组中使用重复值对数组进行分组

Question

我有从mysql数据库中查询的这种数组格式。我查询的这些数据有一些重复，所以我删除了重复。生成的查询低于在阵列格式

[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 
    ) 

我怎样才能输出这种使用该值作为密钥的一个阵列的。

[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

Answer 1

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);