PHP如何结合到数组值

Question

我有2个数组的列表，

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

如果qty_array中的数量为“ 2”，我只想像[“ 4”，“ 4”，“ 4”]一样合并array_product，如果数量为3，我想像[“ 4” ，“ 4”，“ 4”，“ 4”] 友善的帮助

Answer 1

使用array_fill()，然后将它们合并。这假定$qty和$products的长度都相同。

<?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);

结果：

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

https://3v4l.org/Rd4iR

还可以使用for循环：

<?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);