[php] 配列の結合をする方法

Question

お世話になります。
特定のキーが重複した要素を結合する方法を探しております。

Array
(
    [0] => Array
        (
            [post_id] => 1
            [name] => name
        )

    [1] => Array
        (
            [post_id] => 1
            [img] => img
        )

    [2] => Array
        (
            [post_id] => 1
            [url] => url
        )

    [3] => Array
        (
            [post_id] => 2
            [name] => name
        )

    [4] => Array
        (
            [post_id] => 2
            [img] => img
        )

    [5] => Array
        (
            [post_id] => 2
            [url] => url
        )

    [6] => Array
        (
            [post_id] => 3
            [name] => name
        )

    [7] => Array
        (
            [post_id] => 3
            [img] => img
        )

    [8] => Array
        (
            [post_id] => 3
            [url] => url
        )
)

上記のような配列を下記のように編集するのにいい方法があれば教えていただきたいです。

Array
(
    [0] => Array
        (
            [post_id] => 1
            [name] => name
            [img] => img
            [url] => url
        )
    [1] => Array
        (
            [post_id] => 2
            [name] => name
            [img] => img
            [url] => url
        )
    [2] => Array
        (
            [post_id] => 3
            [name] => name
            [img] => img
            [url] => url
        )
)

と表示したいのですが、どうすればよいでしょうか。回答よろしくお願いします。

Comments

[yambejp]

データが競合した場合は上書きですか？

[ankina26]

ご質問ありがとうございます。
競合の場合は上書きです。

Answer 1

$a=[
  ["post_id" => 1,"name" => "name1"],
  ["post_id" => 1,"img" => "img1"],
  ["post_id" => 1,"url" => "url1"],
  ["post_id" => 2,"name" => "name2"],
  ["post_id" => 2,"img" => "img2"],
  ["post_id" => 2,"url" => "url2"],
  ["post_id" => 3,"name" => "name3"],
  ["post_id" => 3,"img" => "img3"],
  ["post_id" => 3,"url" => "url3"],
  ["post_id" => 3,"name" => "url4"],
  ];
$b=array_map(function($x) use($a){
  return array_reduce(array_filter($a,function($y) use($x){
    return $y["post_id"]==$x;
  }),function($x,$y){
    return array_merge($x,$y);
  },[]);
},array_unique(array_map(function($x){
  return $x["post_id"];
},$a)));
print_r($b);

※微調整

Comments

[ankina26]

ありがとうございます！
早速試したところうまく表示できました
ありがとうございました！