PHP如何結合到數組值

Question

我有2個數組的列表，

 [ "4", "4"] - array of product id .
 [ "1", "2"] - array of qty.

如果qty_array中的數量為“ 2”，我只想像[“ 4”，“ 4”，“ 4”]一樣合並array_product，如果數量為3，我想像[“ 4”，“ 4 “，” 4“，” 4“]的幫助

Answer 1

使用array_fill（） ，然后將它們合並。這假定$qty和$products的長度相同。

<?php
$products = [ "4", "5", "8"];
$qty = ["1", "3", "4"];

$result = [];
foreach ($products as $key => $product) {
    $result = array_merge(array_fill(0, $qty[$key], $product), $result);
}

print_r($result);

結果：

Array
(
    [0] => 8
    [1] => 8
    [2] => 8
    [3] => 8
    [4] => 5
    [5] => 5
    [6] => 5
    [7] => 4
)

https://3v4l.org/Rd4iR

也可以使用for循環：

<?php
$products = ["4", "5", "8"];
$qty = ["1", "3", "4"];

$result = [];
foreach ($qty as $key => $q) {
    for ($i=0; $i < $q; $i++) {
        $result[] = $products[$key];
    }
}

print_r($result);