php合并2个带有数值键的多维数组，去掉重复项

Question

给定此数组：

Array
(
[0] => Array
    (
        [title] => this is the newest post
        [ssm_featured_post_id] => 70
    )

[1] => Array
    (
        [title] => sdfsfsdf
        [ssm_featured_post_id] => 63
    )

[2] => Array
    (
        [title] => test
        [ssm_featured_post_id] => 49
    )

[3] => Array
    (
        [title] => Hello world!
        [ssm_featured_post_id] => 1
    )

)

将另一个类似的数组与新值合并的最直接的方法是什么？

第二个数组可以具有新的项或删除的项。

我希望保留第一个数组中项的顺序，并在末尾添加任何新项，并删除不在新数组中的任何项

Array
(
[0] => Array
    (
        [title] => sdfsfsdf
        [ssm_featured_post_id] => 63
    )

[1] => Array
    (
        [title] => this is the newest post
        [ssm_featured_post_id] => 70
    )

[2] => Array
    (
        [title] => test
        [ssm_featured_post_id] => 49
    )

[3] => Array
    (

        [title] => Hello world!
        [ssm_featured_post_id] => 1
    )

[4] => Array
    (
        [title] => awesome post
        [ssm_featured_post_id] => 73
    )

)

Answer 1

您可以使用函数uasort，该函数允许您实现自己的比较函数

function cmp($a, $b) {
    if ($a['ssm_featured_post_id'] == $b['ssm_featured_post_id']) {
        return 0;
    }
    return ($a['ssm_featured_post_id'] < $b['ssm_featured_post_id']) ? -1 : 1; 
}

uasort($array, 'cmp');

为了移除重复项，通过传递数组来扫描重复项

$last_id=-1;
for($i=0; $i < cout($array); $i++){
  if($last_id==$array[$i]['ssm_featured_post_id']){
    unset($array[$i]);//Remove Duplicated Item
  }
  $last_id=$array[$i]['ssm_featured_post_id'];
}

Answer 2

使用array_merge，因为键是数字的。“如果输入数组具有相同的字符串键，则该键的后一个值将覆盖前一个值。但是，如果数组包含数字键，则后一个值不会覆盖原始值”http://php.net/manual/en/function.array-merge.php

Answer 3

嗯，因为我需要检查Array 2和array 1，并合并来自array 2的任何新内容，所以这个解决方案似乎是有效的：

$new_values = array_merge( $slides, $featured_posts );
$new_values = array_unique( $new_values, SORT_REGULAR );