我不明白为什么这给了我一个 t 字符串语法错误。在我看来是正确的！有人可以帮我吗？我已经进行了几周的 php 学习尝试，只是试图理解这种混乱。我知道这是非常愚蠢的事情，但我无法弄清楚！
<?php
// set up some variables
// the toys
$item1 = "X−ray specs";
$item2 = "Watch with built−in poison gas canister";
$item3 = "Exploding chewing gum";
// the price
$item1_cost = 100; $item2_cost = 250; $item3_cost = 32;
// the amount
$item1_qty = 1; $item2_qty = 2; $item3_qty = 15;
// calculate cost for each item
$item1_total = $item1_cost * $item1_qty;
$item2_total = $item2_cost * $item2_qty;
$item3_total = $item3_cost * $item3_qty;
// calculate grand total
$grand_total = $item1_total + $item2_total + $item3_total;
//special secret agent discount − 10%
$discount = 10;
// which reduces total bill amount
$amount = ($grand_total * 10)/100;
// the bottom line
$net_total = $grand_total − $amount;
?>