比较两个数组并在一个特定值(php)中找到所有重复项
我有两个数组,第一个是旧的,第二个是新的。 我想比较两者,只输出重复项 我尝试了一些痛苦的事情:比较两个数组并在一个特定值(php)中找到所有重复项,php,arrays,multidimensional-array,duplicates,key-value,Php,Arrays,Multidimensional Array,Duplicates,Key Value,我有两个数组,第一个是旧的,第二个是新的。 我想比较两者,只输出重复项 我尝试了一些痛苦的事情:array\u intersect和array\u search没有任何结果 第一个数组(旧)包含以下内容作为输出: [0] => Array ( [id] => old_id_1 [color] => red ) [1] => Array ( [id] => old_id_2 [color] => blue ) [2] =&
array\u intersect
和array\u search
没有任何结果
第一个数组(旧)包含以下内容作为输出:
[0] => Array (
[id] => old_id_1
[color] => red
)
[1] => Array (
[id] => old_id_2
[color] => blue
)
[2] => Array (
[id] => old_id_3
[color] => green
)
[3] => Array (
[id] => old_id_4
[color] => purple
)
[4] => Array (
[id] => old_id_5
[color] => yellow
)
第二个(新)输出:
[0] => Array (
[id] => new_id_1
[color] => blue
)
[1] => Array (
[id] => new_id_2
[color] => pink
)
[2] => Array (
[id] => new_id_3
[color] => purple
)
作为回报,我想制作如下内容:
We find 2 duplicates colors :
- blue (new_id_1) in old_id_2
- purple (new_id_3) in old_id_4
如果有人有一些想法。试试这个:
$firstArr = [
['id' => 'old_id_1', 'color' => 'red'],
['id' => 'old_id_2', 'color' => 'blue'],
['id' => 'old_id_3', 'color' => 'green'],
['id' => 'old_id_4', 'color' => 'purple'],
['id' => 'old_id_5', 'color' => 'yellow'],
];
$secondArr = [
['id' => 'new_id_1', 'color' => 'blue'],
['id' => 'new_id_2', 'color' => 'pink'],
['id' => 'new_id_3', 'color' => 'purple'],
];
$firstArrAssoc = array_combine(array_column($firstArr, 'color'), array_column($firstArr, 'id'));
$duplicatesArr = [];
foreach ($secondArr as $row) {
if (array_key_exists($row['color'], $firstArrAssoc)) {
$duplicatesArr[] = "- $row[color] ($row[id]) in {$firstArrAssoc[$row['color']]}";
}
}
echo "We find " . count($duplicatesArr) . " duplicates colors :\n";
echo implode("\n", $duplicatesArr);
输出:
We find 2 duplicates colors :
- blue (new_id_1) in old_id_2
- purple (new_id_3) in old_id_4