PHP数组删除重复的键值并仅显示一个

这里的想法是，当有一个重复的用户id时，它只会显示一个？这是预期的结果：

Array
(
    [0] => Array
        (
            [user_id] => 78
            [post_id] => 3
            [post_user_added_id] => 2
        )

    [1] => Array
        (
            [user_id] => 76
            [post_id] => 8
            [post_user_added_id] => 16
        )

    [2] => Array
        (
            [user_id] => 78
            [post_id] => 9
            [post_user_added_id] => 12
        )

    [3] => Array
        (
            [user_id] => 76
            [post_id] => 9
            [post_user_added_id] => 15
        )

     [4] => Array
         (
             [user_id] => 77
             [post_id] => 9
             [post_user_added_id] => 15
         )

)

显示[2]键而不是[0]键或[1]键而不是[3]键的原因，因为我想获取重复键的底部键。这有点难以解释，但我希望您理解我期望的场景或输出

非常感谢您的帮助！谢谢！：）

试试这个：

 Array
 (
      [2] => Array
          (
             [user_id] => 78
             [post_id] => 9
             [post_user_added_id] => 12
           )

        [3] => Array
            (
                [user_id] => 76
                [post_id] => 9
                [post_user_added_id] => 15
            )

         [4] => Array
             (
                 [user_id] => 77
                 [post_id] => 9
                 [post_user_added_id] => 15
             )

    )

试一试

输出

$array = Array (
        "0" => Array (
                "user_id" => 78,
                "post_id" => 3,
                "post_user_added_id" => 2 
        ),

        "1" => Array (
                "user_id" => 76,
                "post_id" => 8,
                "post_user_added_id" => 16 
        ),

        "2" => Array (
                "user_id" => 78,
                "post_id" => 9,
                "post_user_added_id" => 12 
        ),

        "3" => Array (
                "user_id" => 76,
                "post_id" => 9,
                "post_user_added_id" => 15 
        ),

        "4" => Array (
                "user_id" => 77,
                "post_id" => 9,
                "post_user_added_id" => 15 
        ) 
);
$keys = array ();

// Get Position
foreach ( $array as $key => $value ) {
    $keys [$value ['user_id']] = $key;
}

// Remove Duplicate
foreach ( $array as $key => $value ) {
    if (! in_array ( $key, $keys )) {
        unset ( $array [$key] );
    }
}
var_dump ( $array );

---

您可以使用foreach循环来覆盖用户id。我认为这样应该可以

array
  2 => 
    array
      'user_id' => int 78
      'post_id' => int 9
      'post_user_added_id' => int 12
  3 => 
    array
      'user_id' => int 76
      'post_id' => int 9
      'post_user_added_id' => int 15
  4 => 
    array
      'user_id' => int 77
      'post_id' => int 9
      'post_user_added_id' => int 15

---

以下内容对我有用，用于清洁以下内容：

$new = array();
foreach ($array as $value)
{
    $new[$value['user_id']] = $value;
}
print_r($new);

代码：

---

用于（$i=0；$i到目前为止您尝试了什么？—请发布您的代码，并明确指出您遇到了什么障碍。我没有尝试任何东西，因为我真的不知道执行预期输出的逻辑。此网站是为程序员提供的，因此请参阅此处的常见问题解答，询问哪些问题。您考虑过将数组移动到d中吗atabase？我是一名程序员，这就是我提出PHP数组值的原因。我只是问如何删除数组中的重复值。您留下的前一个数组工作得很好！不需要数组_reverse（）它，因为我想得到重复键值的底键。：）您可能需要反转初始数组，因为这不是所需的输出。
$new = array();
foreach ($array as $value)
{
    $new[$value['user_id']] = $value;
}
print_r($new);

$arr = array(

    array("ID"=>"234"),
    array("ID"=>"235"),
    array("ID"=>"236"),
    array("ID"=>"236"),
    array("ID"=>"234"),
    );

for ($i=0; $i <count($arr) ; $i++) {

    $distinct_id = $arr[$i]["ID"]; // this is the ID for which we want to eliminate the duplicates
    $position = $i; // position of that array (so we ignore it)
    $unset_arr = array(); // these duplicate entries will be removed

    // Collect list of duplicates to remove
    for ($y=0; $y <count($arr) ; $y++) {

        // Skip the position of the array that we're checking (we want to remove duplicate not the original)
        if($y == $position)
            continue;

        // If found remove and reset keys
        if($arr[$y]["ID"] == $distinct_id) {
            $unset_arr[] = $y;
        }

    }

    // Remove IDs collected in the loop above
    foreach ($unset_arr as $k) {
        unset($arr[$k]);
    }

    // Reset keys
    $arr = array_values($arr);

}