php - 使用 foreach 循环查找变量 POST 数据

Question

为什么这不起作用？

// I'm sending this data: $_POST['amount_1'] = '3';
$val = '1'; // This is coming from a foreach loop, but I'm specifying here for simplicity
echo $_POST['amount_'.$val]; // Returns null
echo $_POST['amount_1']; // Returns 3

尝试获取 POST 值时是否不允许使用变量？

编辑：每个请求发布更多代码。

$outgoing = array();

foreach($_POST as $key => $val):
    if(strpos($key,'_number_')){ // Matching 'item_number_' would return false because of 0-indexing
        $item_id = $val;
        $test = str_replace('item_number_',$key); // Realized when pasting this that I didn't have a $replacement defined.
        $quantity = $_POST['quantity_'.$test];

        $name = $_POST['lp-name'];
        $email = $_POST['lp-email'];
        $phone = $_POST['lp-phone'];

    array_push($outgoing,array($test,$item_id,$quantity,$name,$email,$phone));
    }
endforeach;

$json = json_encode($outgoing);

现在工作。我的 str_replace() 中没有$replacement定义。

Answer 1

您可以在表单元素中使用数组表示法，而不是这样做：

<form>
    <input name='amount[]' value='this is first'>
    <input name='amount[]' value='this is second'>
    <input name='amount[]' value='this is last'>
</form>

提交此表单将以数组格式发送数据：

echo $amount[0]; // this is first
echo $amount[1]; // this is second
echo $amount[2]; // this is last

最好的祝愿，

科尔文