如何在php中通过键合并数组数组？

Question

So questions of this nature have been asked 1000 times on stack overflow, but none of them I've searched through so far address the issue that I'm having. I have two arrays like this:

$cupcake_sales = [
   ['date' => '05/09/1992', 'num_cupcakes_sold' => 30 ],
   ['date' => '05/11/1992', 'num_cupcakes_sold' => 25 ],
];

and another array like this:

$cupcake_revenue = [
    ['date' => '05/10/1992', 'revenue' => '$40'],
    ['date' => '05/11/1992', 'revenue' => '$100'],
];

what I need is an array like this:

$cupcake_sales_revenue = [
    ['date' => '05/09/1992', 'num_cupcakes_sold' => 30],
    ['date' => '05/10/1992', 'num_cupcakes_sold' => 25, 'revenue' => '$40'], 
    ['date' => '05/11/1992', 'revenue' => '$100'],
];

any good way of doing this?

Answer 1

This should work for you:

(Here I just loop through both arrays with array_map() and if the date is the same I merge the 2 arrays together with array_merge() and assign it to the results array. If they are different I just append both arrays to the result array in the current iteration.)

<?php

    $cupcake_sales_revenue = [];

    array_map(function($v1, $v2)use(&$cupcake_sales_revenue){
        if($v1["date"] == $v2["date"]) {
            $cupcake_sales_revenue[] = array_merge($v1, $v2);
        } else {
            $cupcake_sales_revenue[] = $v1;
            $cupcake_sales_revenue[] = $v2;
        }
    }, $cupcake_sales, $cupcake_revenue);

    print_r($cupcake_sales_revenue);


?>

output:

Array
(
    [0] => Array
        (
            [date] => 05/09/1992
            [num_cupcakes_sold] => 30
        )

    [1] => Array
        (
            [date] => 05/10/1992
            [revenue] => $40
        )

    [2] => Array
        (
            [date] => 05/11/1992
            [num_cupcakes_sold] => 25
            [revenue] => $100
        )

)