php中的数组按数组键合并？

是否有一个可以按键组合数组的好函数？（本例中为pid）

array
  0 => 
    array
      'product' => string 'a product pid 3' (length=9)
      'name' => string 'adamramadhan' (length=12)
      'pid' => string '3' (length=1)
      'timecreate' => string '2011-02-26 13:30:07' (length=19)
  1 => 
    array
      'product' => string 'a product pid 4' (length=8)
      'name' => string 'adamramadhan' (length=12)
      'pid' => string '4' (length=1)
      'timecreate' => string '2011-02-26 13:30:54' (length=19)

及

差不多

array
  0 => 
    array
      'product' => string 'a product pid 3' (length=9)
      'name' => string 'adamramadhan' (length=12)
      'pid' => string '3' (length=1)
      'timecreate' => string '2011-02-26 13:30:07' (length=19)
      'comments' => array 
        0 => 
          array
            'pid' => string '3' (length=1)
            'comment' => string 'a comment on pid 3' (length=8)
        2 => 
          array
            'pid' => string '3' (length=1)
            'comment' => string 'a comment on pid 3' (length=5)
        4 => 
          array
            'pid' => string '3' (length=1)
            'comment' => string 'a comment on pid 3' (length=7)
        6 => 
          array
            'pid' => string '3' (length=1)
            'comment' => string 'a comment on pid 3' (length=18)
  1 => 
    array
      'product' => string 'a product pid 4' (length=8)
      'name' => string 'adamramadhan' (length=12)
      'pid' => string '4' (length=1)
      'timecreate' => string '2011-02-26 13:30:54' (length=19)
      'comments' => array 
        1 => 
          array
            'pid' => string '4' (length=1)
            'comment' => string 'a comment on pid 4' (length=8)
        3 => 
          array
            'pid' => string '4' (length=1)
            'comment' => string 'a comment on pid 4' (length=5)
        5 => 
          array
            'pid' => string '4' (length=1)
            'comment' => string 'a comment on pid 4' (length=7)
        7 => 
          array
            'pid' => string '4' (length=1)
            'comment' => string 'a comment on pid 4' (length=18)

或者在每个产品注释数组上没有pid（嵌套在产品数组上）

谢谢你的光临

---

Adam Ramadhan

你不在乎整数第一个键吗？对不起，我不知道哪一个是int第一个键，products数组中的第一个键？不要紧，第一个数组中的0-1和第二个数组中的0-7。但请检查我的解决方案：）结果是什么样的？多“混合”？我的错，在第二个foreach中将

$arr1_new

更改为

$arr2_new

，现在应该可以工作了。谢谢你，powtac，你节省了我很多时间，这件事已经解决了6个小时了。逐个测试php数组函数。愿上帝有一天以某种方式报答你：DNo prob Adam，一旦每个人都必须学会如何处理多维数组；）

// Use pid as key
foreach ($arr1 as $key => $value) {
    $arr1_new[$value['pid']] = $value;
}

// Move comments into $arr1_new
foreach($arr2 as $key => $value) {
    $arr2_new[$value['pid']]['comments'][] = $value['comment'];
    // $arr2_new[$value['pid']]['comments'][] = $value; // if you really need all information here...
}

var_dump($arr2_new);

// Use pid as key
foreach ($arr1 as $key => $value) {
    $arr1_new[$value['pid']] = $value;
}

// Move comments into $arr1_new
foreach($arr2 as $key => $value) {
    $arr2_new[$value['pid']]['comments'][] = $value['comment'];
    // $arr2_new[$value['pid']]['comments'][] = $value; // if you really need all information here...
}

var_dump($arr2_new);