如何将变量值插入到数组键中？

Question

我有这样一段代码：

<?php 
require_once ('mercadopago.php'); 

$monto = $_POST['amount']; 

$mp = new MP('XXXX', 'XXXXXXXXXXX'); 

$preference_data = array(
    "items" => array(
     array(
      "title" => "item", 
      "quantity" => 1, 
      "currency_id" => "usd", 
      "unit_price" => HERE 
     ) 
    ) 
); 

$preference = $mp->create_preference ($preference_data); 

?> 

，我需要做的变量$蒙托，我从一个岗位确定之前发送给它的值改为“UNIT_PRICE”它说：“在这里”。我试着写了$ monto，但它没有奏效。

有一些我可以做到这一点？谢谢你，并为我的英语感到抱歉。它不是很好。

Answer 1

你可以使用变量，如：

//check if your POST data is not empty and assign some default value in case its empty 
$monto = (!empty($_POST['amount'])) ? $_POST['amount'] : 0; //0 is default value 
$preference_data = array(
    "items" => array(
     array(
      "title" => "item", 
      "quantity" => 1, 
      "currency_id" => "usd", 
      "unit_price" => $monto 
     ) 
    ) 
); 

Answer 2

<?php 
$preference_data = array(
    "items" => array(
     array(
      "title" => "RosquinhaPvP - NickDoPlayer - VIP", 
      "quantity" => 1, 
      "currency_id" => "BRL", 
      "unit_price" => doubleval($monto) 
     ) 
    ) 
);