数组合并

[90至尊皇朝]

将数组

$arr = array(
            array(
                 "class" => "A",
                "name" => "xiaoming,xiaohong",                
            ),
           array(
                 "class" => "B",
                "name" => "xiaohua,xiaogou",                
            ),
            array(
                 "class" => "A",
                "name" => "xiaoming,xiaocai",                
            ),
        );

合并成如下形式(相同项要去掉)

$arr = array(
            array(
                 "class" => "A",
                "name" => "xiaoming,xiaohong,xiaocai",                
            ),
           array(
                 "class" => "B",
                "name" => "xiaohua,xiaogou",                
            ),
        );

[xuzuning]

$arr = array(
            array(
                 "class" => "A",
                "name" => "xiaoming,xiaohong",                
            ),
           array(
                 "class" => "B",
                "name" => "xiaohua,xiaogou",                
            ),
            array(
                 "class" => "A",
                "name" => "xiaoming,xiaocai",                
            ),
        );

foreach($arr as $i=>$v) {
  $k = $v['class'];
  if(! isset($arr[$k])) $arr[$k] = $v;
  else $arr[$k]['name'] = join(',', array_unique (explode(',', $arr[$k]['name'] . ",$v[name]")));
  unset($arr[$i]);
}
var_export($arr);

array (
  'A' => 
  array (
    'class' => 'A',
    'name' => 'xiaoming,xiaohong,xiaocai',
  ),
  'B' => 
  array (
    'class' => 'B',
    'name' => 'xiaohua,xiaogou',
  ),
)

[90至尊皇朝]

那若是组装成这样的呢

$arr = array(
            "A" => "xiaoming,xiaohong,xiaocai",
            "B" => "xiaohua,xiaogou",      
        );

怎么组装

[Sunshine白衬衫]

虽让不知道怎么写，但帮顶一下

引用 1 楼 xuzuning 的回复:

$arr = array(
            array(
                 "class" => "A",
                "name" => "xiaoming,xiaohong",                
            ),
           array(
                 "class" => "B",
                "name" => "xiaohua,xiaogou",                
            ),
            array(
                 "class" => "A",
                "name" => "xiaoming,xiaocai",                
            ),
        );

foreach($arr as $i=>$v) {
  $k = $v['class'];
  if(! isset($arr[$k])) $arr[$k] = $v;
  else $arr[$k]['name'] = join(',', array_unique (explode(',', $arr[$k]['name'] . ",$v[name]")));
  unset($arr[$i]);
}
var_export($arr);

array (
  'A' => 
  array (
    'class' => 'A',
    'name' => 'xiaoming,xiaohong,xiaocai',
  ),
  'B' => 
  array (
    'class' => 'B',
    'name' => 'xiaohua,xiaogou',
  ),
)

[90至尊皇朝]

           _ooOoo_
                  o8888888o
                  88" . "88
                  (| -_- |)
                  O\  =  /O
               ____/`---'\____
             .'  \\|     |//  `.
            /  \\|||  :  |||//  \
           /  _||||| -:- |||||-  \
           |   | \\\  -  /// |   |
           | \_|  ''\---/''  |   |
           \  .-\__  `-`  ___/-. /
         ___`. .'  /--.--\  `. . __
      ."" '<  `.___\_<|>_/___.'  >'"".
     | | :  ` - `.;`\ _ /`;.`/ - ` : | |
     \  \ `-.   \_ __\ /__ _/   .-` /  /
======`-.____`-.___\_____/___.-`____.-'======
                   `=---='
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
            佛祖保佑       永无BUG

[xuzuning]

总要自己动动脑子的吧？

$arr = array(
            array(
                 "class" => "A",
                "name" => "xiaoming,xiaohong",                
            ),
           array(
                 "class" => "B",
                "name" => "xiaohua,xiaogou",                
            ),
            array(
                 "class" => "A",
                "name" => "xiaoming,xiaocai",                
            ),
        );

foreach($arr as $i=>$v) {
  $k = $v['class'];
  if(! isset($arr[$k])) $arr[$k] = $v['name'];
  else $arr[$k] = join(',', array_unique (explode(',', $arr[$k] . ",$v[name]")));
  unset($arr[$i]);
}
var_export($arr);

array (
  'A' => 'xiaoming,xiaohong,xiaocai',
  'B' => 'xiaohua,xiaogou',
)

[90至尊皇朝]

我自己 遍历 得 foreach两遍；目的就是为了减少循环，脑子是个好东西，我在补脑，感谢