我正在尝试创建一个php脚本，该脚本从表单中获取输入值，然后在提交表单时输出建议的行程路线。我将表单方法设置为POST。问题是我得到空白输出。我不确定问题是我的代码还是POST方法。class Truck { // constructor public function __construct($truck_name, $max_weight) { $this->truck_name = $truck_name; $this->max_weight = $max_weight; } public function print_truck() { if (isset($_POST['submit'])) { $truck_1 = new Truck($truck_name, $max_weight); $this->truck_name = $_POST['truck_name']; $this->max_weight = $_POST['max_weight']; } echo $this->truck_name; }} class Location { // constructor public function __construct($location_name, $location_weight) { $this->location_name = $location_name; $this->location_weight = $location_weight; } public function trip_1() { if (isset($_POST['submit'])) { $location_2 = new Location($location_name, $location_weight); $this->location_name = $_POST['location_2']; $this->location_weight = $_POST['package_2']; $location_3 = new Location($location_name, $location_weight); $this->location_name = $_POST['location_3']; $this->location_weight = $_POST['package_3']; } echo "Trip #1 \n" . $this->location_2 . ", " . $this->location_3 . "\n"; } public function trip_2() { if (isset($_POST['submit'])) { $location_1 = new Location($location_name, $location_weight); $this->location_name = $_POST['location_1']; $this->location_weight = $_POST['package_1']; } echo "Trip #2 \n" . $this->location_1; }}# Here's the output HTML:?><!DOCTYPE HTML><html><head> <title>Deliveries</title></head>这是预期的结果：行程1：位置2，位置3行程2：位置1
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