Php关联数组函数，用于在数组中查找重复的id值和非重复值

如果3页有2篇文章，那么获取这些文章的函数将返回[6]的数组，如下所示：

Array
(
    [0] => Array
        (
            [post_text] => Test 3:30
            [post_id] => 46
            [concrete_id] => 5c3f55b5ebb084c078c92d13
            [post_data_start] => 2019-02-06 15:31:00
            [post_type] => II
            [page_id] => 7
        )

    [1] => Array
        (
            [post_text] => Test 3:30
            [post_id] => 46
            [concrete_id] => fus98f67a9
            [post_data_start] => 2019-02-06 15:31:00
            [post_type] => II
        )

    [2] => Array
        (
            [post_text] => Test 3:30
            [post_id] => 46
            [concrete_id] => 5c3f55b5ebb084c078c94c0
            [post_data_start] => 2019-02-06 15:31:00
            [post_type] => II
        )

    [3] => Array
        (
            [post_text] => test
            [post_id] => 43
            [concrete_id] => 5c3f55b5ebb084c078c92d13
            [post_data_start] => 2019-02-06 17:31:00
            [post_type] => II
        )

    [4] => Array
        (
            [post_text] => test
            [post_id] => 43
            [concrete_id] => fus98f67a9
            [post_data_start] => 2019-02-06 17:31:00
            [post_type] => II
        )

    [5] => Array
        (
            [post_text] => test
            [post_id] => 43
            [concrete_id] => 5c581a33ebb084c078ceb6cc
            [post_data_start] => 2019-02-06 17:31:00
            [post_type] => II
        )

)

在cURL调用中，我必须将

concrete\u id

作为数组传递（因为每次调用需要花费10个字节），在这种情况下，我必须进行6次cURL调用，但我只能进行2次调用，将

concrete\u id

作为数组传递。我使用的API就是这样工作的（但问题与API无关）

我想得到一个具有唯一id的数组，但数组的值不同（或者只需

concrete\u id

即可）：

这是我能想到的最好办法，但我的大脑很痛：

$tmpposts=$posts;
            foreach($posts as $k=>$post){
                foreach($tmpposts as $k2=>$post2){
                    if($post['post_id']==$post2['post_id']){
                        $post2['concrete_id']=array($post2['concrete_id']);

                        array_push($post2['concrete_id'],$post['concrete_id']);
                        $array[]=$post2;
                        array_splice($array,$k);
                    }
                }
            }

---

您可以使用simple

for loop

减少数组。考虑如下：

$arr = []; // example just with "id" and "concrete_id" but you can add all other data
$arr[] = array("id" => 46, "concrete_id" => "5c3f55b5ebb084c078c92d13");
$arr[] = array("id" => 46, "concrete_id" => "fus98f67a9");
$arr[] = array("id" => 46, "concrete_id" => "5c3f55b5ebb084c078c94c0");
$arr[] = array("id" => 43, "concrete_id" => "5c3f55b5ebb084c078c92d13");
$arr[] = array("id" => 43, "concrete_id" => "fus98f67a9");

foreach($arr as $e) {
    if (!isset($ans[$e["id"]])) {
        $ans[$e["id"]] = $e; // element doesn't exist set first time
        $ans[$e["id"]]["concrete_id"] = [$e["concrete_id"]]; // make the concrete_id as array with 1 element
    } else { // the id already set just append the concrete_id
        $ans[$e["id"]]["concrete_id"][] = $e["concrete_id"];
    }
}

---

如果不希望

id

作为结果中的键，则可以使用：

$ans=array\u values（$ans）
Mah-man！这很好用。我数组中的id称为post_id，是的，我使用了数组_值。
$arr = []; // example just with "id" and "concrete_id" but you can add all other data
$arr[] = array("id" => 46, "concrete_id" => "5c3f55b5ebb084c078c92d13");
$arr[] = array("id" => 46, "concrete_id" => "fus98f67a9");
$arr[] = array("id" => 46, "concrete_id" => "5c3f55b5ebb084c078c94c0");
$arr[] = array("id" => 43, "concrete_id" => "5c3f55b5ebb084c078c92d13");
$arr[] = array("id" => 43, "concrete_id" => "fus98f67a9");

foreach($arr as $e) {
    if (!isset($ans[$e["id"]])) {
        $ans[$e["id"]] = $e; // element doesn't exist set first time
        $ans[$e["id"]]["concrete_id"] = [$e["concrete_id"]]; // make the concrete_id as array with 1 element
    } else { // the id already set just append the concrete_id
        $ans[$e["id"]]["concrete_id"][] = $e["concrete_id"];
    }
}