如何通过 user_id Laravel 更改数组结构

Question

I have array structure like this:

[
  {product:"A", user_id:1},
  {product:"B", user_id:2},
  {product:"C", user_id:1}
]

I want re-structure array by user_id like this:

[
  {user_id:1, product:["A","C"]},
  {user_id:2, product:["B"]}
]

How to change like that using php laravel, Thank you for your answer.

Answer 1

If I understand your question correctly, something like this would work:

NOTE: Im assuming your code is meant to describe an array of stdClass objects in php since what you've posted isnt valid php, if you really have an array of arrays, you'll need to adjust the syntax below to account for that.

<?php

$products = [
    (object) ['product' => "A", 'user_id' => 1],
    (object) ['product' => "B", 'user_id' => 2],
    (object) ['product' => "C", 'user_id' => 1]
];

$userProducts = [];
foreach ($products as $product) {

    // check if we have an object for this user id in our new array already 
    // and if so, just add this product to it
    $alreadyAdded = false;
    foreach ($userProducts as $userProduct) {
        if ($userProduct->user_id == $product->user_id) {
            $alreadyAdded = true;
            $userProduct->product[]= $product->product;
            break;
        }
    }

    // if no object for this user id in our new array yet, add one now
    if (!$alreadyAdded) {
        $newProduct = new \stdClass();
        $newProduct->user_id = $product->user_id;
        $newProduct->product = [$product->product];
        $userProducts[]= $newProduct;
    }
}

var_dump($userProducts);