PHP通过两个多维数组的公共密钥匹配并将两个数组合并为两个数组键[duplicate]

Question

This question already has an answer here:

• PHP merge two arrays on the same key AND value 5 answers

Good evening, I have a little bit problem. I have two array. like

$firstArr = Array(
                [0] => Array(                   
                    [customer_id] => 11,
                    [home_delivery] => no,
            ),
                [1] => Array(
                    [customer_id] => 12,
                    [home_delivery] => no,
            ),
                [2] => Array(
                    [customer_id] => 13,
                    [home_delivery] => no,
            ),
        );

        $secondArr = Array(
                [0] => Array(
                    [customer_id] => 11,
                    [test] => no,
                    [is_active] => yes,
            ),
                [1] => Array(
                    [customer_id] => 22,
                    [test] => no,
                    [is_active] => yes,
            ),
        );

Now i want to get the result like first array's customer_id match with the second array customer_id. Id two array's customer id is same the the value of second array add with first array otherwise the value will be null. Hope guys you got my point what i want. The output which i want is like the below.

$getResult = Array(
                [0] => Array(
                    [customer_id] => 11,
                    [home_delivery] => no,
                    [test] => no,
                    [is_active] => yes,
            ),
                [1] => Array(
                    [customer_id] => 12,
                    [home_delivery] => no,
                    [test] => '',
                    [is_active] => '',
            ),
                [2] => Array(
                    [customer_id] => 13,
                    [home_delivery] => no,
                    [test] => '',
                    [is_active] => '',
            ),
        );

I have tried by this code, but it doesnt work. Please help me.

$mergedArray = array();
        foreach ($firstArr as $index1 => $value1) {
            foreach ($secondArr as $index2 => $value2) {
                if ($array1[$index1]['customer_id'] == $array2[$index2]['customer_id']) {
                    $mergedArray[] = array_merge($firstArr[$index1], $secondArr[$index2]);
                }
            }
        }
echo "<pre>"; print_r($mergedArray); echo "</pre>";

</div>

Answer 1

You can do this :

<?php 

        $results = [];
        // Get all unique keys from both arrays
        $keys = array_unique(array_merge(array_keys($firstArr[0]), array_keys($secondArr[0])));

        // Make array of common customer_ids
        foreach (array_merge($firstArr, $secondArr) as $record) {
            $results[$record['customer_id']] = isset($results[$record['customer_id']]) ? array_merge($results[$record['customer_id']], $record) : $record;
        }
        // Fill keys which are not present with blank strings
        foreach ($keys as $key) {
            foreach ($results as $index => $result) {
                if(!array_key_exists($key, $result)){
                    $results[$index][$key] = '';
                }
            }
        }
        print_r($results);