这两天整一个数据，捯饬了好久。。。

需求是这样的

 

<?php

$a = array ();

$a[] = ['week'=>'1','day'=>'1'];

$a[] = ['week'=>'1','day'=>'2'];

$a[] = ['week'=>'1','day'=>'4'];

$a[] = ['week'=>'2','day'=>'1'];

$a[] = ['week'=>'2','day'=>'3'];

$a[] = ['week'=>'2','day'=>'5'];

// var_dump($a);

//期望输出

//$b =['1'=>'1,2,4'],['2'=>'1,3,5']

 

想了好多php自带的数组函数，都没有成功，后来去找大神了。

思路1：

因为数据是从数据库直接查出来的

想要的结果样式其实是可以通过SQL实现：

SELECT week,GROUP_CONCAT(`day`) as day

FROM `user_progress`

where openid ='oC_c95aBUFxnsulu6AWiS9iivtkw' && level=1

GROUP BY `week`;

结果：

这个MYSQL函数可以学习一下：GROUP_CONCAT

思路2：通过php处理实现

 

$a = array ();

$b = array ();

$a[] = ['week'=>'1','day'=>'1'];

$a[] = ['week'=>'1','day'=>'2'];

$a[] = ['week'=>'1','day'=>'4'];

$a[] = ['week'=>'2','day'=>'1'];

$a[] = ['week'=>'2','day'=>'3'];

$a[] = ['week'=>'2','day'=>'5'];

// var_dump($a);

 

foreach($a as $value){

$b[$value['week']][] = $value['day'];

}

var_dump($b);

结果

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