php数组合并问题，麻烦大佬来指点下，谢谢

[红尘无爱]

Array
(
    [0] => Array
        (
            [title] => Array
                (
                    [0] => '标题'
                )

            [user] => Array
                (
                    [0] => 用户1
                    [1] => 用户2
                )

            [ct] => Array
                (
                    [0] => 回复1
                    [1] => 回复2
                )

            [time] => Array
                (
                    [0] => 2019-04-10 11:34:37
                    [1] => 2019-04-10 11:39:30
                )

        )
[1] => Array
        (
            [title] => Array
                (
                    [0] => 标题2
                )

            [user] => Array
                (
                    [0] => 用户3
                    [1] => 用户4
                )

            [ct] => Array
                (
                    [0] => 回复3
                    [1] => 回复4
                )

            [time] => Array
                (
                    [0] => 2019-04-10 11:06:30
                    [1] => 2019-04-10 11:22:57
                )

        )

  [0] => Array
        (
            [id] => 735
            [title] => 标题2
        )

    [1] => Array
        (
            [id] => 727
            [title] => 标题
        )

想让他变成这样，根据title把id追加进数组里

 Array
(
    [0] => Array
        (
            [id] => 727
            [title] => Array
                (
                    [0] => '标题'
                )

            [user] => Array
                (
                    [0] => 用户1
                    [1] => 用户2
                )

            [ct] => Array
                (
                    [0] => 回复1
                    [1] => 回复2
                )

            [time] => Array
                (
                    [0] => 2019-04-10 11:34:37
                    [1] => 2019-04-10 11:39:30
                )

        )
[1] => Array
        (
            [id] => 735
            [title] => Array
                (
                    [0] => 标题2
                )

            [user] => Array
                (
                    [0] => 用户3
                    [1] => 用户4
                )

            [ct] => Array
                (
                    [0] => 回复3
                    [1] => 回复4
                )

            [time] => Array
                (
                    [0] => 2019-04-10 11:06:30
                    [1] => 2019-04-10 11:22:57
                )

        )

[YYYYolanda]

这个很简单，两个数组都遍历，对比title就可以了。

引用

function addId($arr,$idarr){
    if (!empty($arr) && !empty($idarr)){
        foreach ($arr as &$a){
            foreach ($idarr as $ida){
                if ($a['title'] == $ida['title']){
                    $a['id'] = $ida['id'];
                }
            }
        }
    }
    return $arr;
}

[dnpao]

$arr = [
			[
				'title' => ['标题'],
				'user'  => ['用户1', '用户2'],
				'ct'    => ['回复1', '回复2'],
				'time'  => ['2019-04-10 11:34:37', '2019-04-10 11:39:30'],
			],
			[
				'title' => ['标题2'],
				'user'  => ['用户3', '用户4'],
				'ct'    => ['回复3', '回复4'],
				'time'  => ['2019-04-10 11:34:37', '2019-04-10 11:39:30'],
			]
		];
		$new = [
			[
				'id'    => 735,
				'title' => '标题2',
			],
			[
				'id'    => 727,
				'title' => '标题',
			]
		];

		$col = array_column($new, 'id', 'title');
		$data = [];
		foreach ($arr as $v) {
			$data[] = $v['title'] && array_key_exists($v['title'][0], $col) ? array_merge($v, ['id' => $col[$v['title'][0]]]) : $v;
		}

		die(print_r($data));