即时通讯对于PHP来说相当新颖,因为我一直在寻找最近2小时的信息,没有任何示例似乎有所帮助。 我有什么我认为被称为嵌套数组?他们两个人。几乎我需要能够匹配来自不同阵列的id。并减少库存的金额。PHP在foreach中更改数组值
<?php
$items = array(
array('id' => 34, 'name' => 'Kompiuterius ASUS ASX89', 'price' => 639.00, 'stock' => 3),
array('id' => 1008, 'name' => 'Monitorius AOC 27IPS', 'price' => 223.00, 'stock' => 7),
array('id' => 965, 'name' => 'Tracer kilimėlis pelytei', 'price' => 2.00, 'stock' => 20),
array('id' => 567, 'name' => 'Pelytė Logitech A52', 'price' => 16.00, 'stock' => 14),
array('id' => 1123, 'name' => 'Klaviatūra Razer Chroma 2016', 'price' => 109.00, 'stock' => 6)
);
$orders = array(
array('purchase_date' => '2016-11-12', 'item_id' => 34, 'quantity' => 1),
array('purchase_date' => '2016-11-12', 'item_id' => 1008, 'quantity' => 2),
array('purchase_date' => '2016-11-13', 'item_id' => 965, 'quantity' => 1),
array('purchase_date' => '2016-11-15', 'item_id' => 1123, 'quantity' => 4),
array('purchase_date' => '2016-11-11', 'item_id' => 34, 'quantity' => 2)
);
foreach ($orders as $order){
$purchase_id = $order['item_id'];
$purchase_quantity = $order['quantity'];
foreach ($items as $item){
$stock_id = $item['id'];
$stock_quantity = $item['stock'];
if ($purchase_id == $stock_id){
$stock_quantity = $stock_quantity - $purchase_quantity;
$item['stock'] = $stock_quantity; //something with &?
echo 'Prekiu, pazymetu numeriu ' . $stock_id . ' liko: ' . $stock_quantity . ' vnt. ' . '<br/>';
}
}
}
?>
这就是我的代码。我认为这可能会起作用,因为在退出“if”功能之前,我会给股票赋予新的价值。但我想我错了
$item['stock'] = $stock_quantity;
任何建议将受到欢迎
EDIT1:什么即时试图做的是从$项目阵列ID从$比较ID的订单。如果它与库存减去数量匹配并显示剩余库存。希望其更清晰
你能解释更准确地说你想要做什么? – Perumal
使用需要传递你想改变的数组通过引用http://stackoverflow.com/questions/3307409/php-pass-by-reference-in-foreach – markdwhite
你能特别说出什么问题吗? – kerv