如何基于表单字段输入值创建PHP输出？
我正在尝试创建一个php脚本，它从表单中获取输入值，然后在提交表单时输出推荐的旅行路线。我将form方法设置为POST。问题是我得到了一个空白输出 我不确定问题是我的代码还是表单POST方法如何基于表单字段输入值创建PHP输出？,php,Php,我正在尝试创建一个php脚本，它从表单中获取输入值，然后在提交表单时输出推荐的旅行路线。我将form方法设置为POST。问题是我得到了一个空白输出 我不确定问题是我的代码还是表单POST方法 class Truck { // constructor public function __construct($truck_name, $max_weight) { $this->truck_name = $truck_name; $this-&g
class Truck {
// constructor
public function __construct($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" . $this->location_1;
}
}
# Here's the output HTML:
?>
<!DOCTYPE HTML>
<html lang="en">
<head>
<title>Deliveries</title>
</head>
<body class="container">
<form method="post" action="">
<input type="text" name="truck_name" Placeholder="Truck Name" value="" required>
<input type="number" name="max_weight" Placeholder="Max weight in lbs" value="" required>
<h4>Delivery Locations</h4>
<input type="text" name="location_1" Placeholder="Location 1" value="" required>
<input type="number" name="package_1" Placeholder="Package weight in lbs" value="" required>
<input type="text" name="location_1" Placeholder="Location 2" value="">
<input type="number" name="package_2" Placeholder="Package weight in lbs" value="" required>
<input type="text" name="location_1" Placeholder="Location 3" value="" required>
<input type="number" name="package_3" Placeholder="Package weight in lbs" value="" required>
<input type="submit" name="submit" value="Get Trips">
<input type="reset" name="reset" value="Reset">
</form>
<?php
if (isset($_POST['submit']))
{ ?>
<h2><?php echo "Trip Routes"; ?></h2>
<?php
$truck_1->print_truck();
trip_1();
trip_2();
}
?>
</body>
</html>
位置1在尝试调用方法之前，不实例化任何类。您需要实例化该类，例如$truck=newtruck；然后从那里调用你的方法 正如我在一篇评论中提到的，随后被删除并被指出——上面的代码没有多大意义。我很感激您正在学习PHP，但是类对象实例化和赋值的方式是不正确的。在类方法中调用类构造函数是一种从头到脚的操作。应该使用所需的任何参数实例化该类，然后调用它的方法。一个类可以作为另一个类的参数给出——这类似于我在下面所做的，我创建了一个名为Trip的新类，并分配了一个truck和location的实例。。。。我可能没有抓住要点，但希望能有所帮助
<?php
class Truck {
private $truck_name;
private $truck_weight;
public function __construct($name=false, $weight=false) {
$this->truck_name = $name;
$this->max_weight = $weight;
}
public function get_name(){
return $this->truck_name;
}
public function get_max_weight(){
return $this->max_weight;
}
}
class Location {
private $location_name;
private $location_weight;
public function __construct($name=false, $weight=false) {
$this->location_name = $name;
$this->location_weight = $weight;
}
public function get_location(){
return $this->location_name;
}
public function get_location_weight(){
return $this->location_weight;
}
}
class Trip{
private $truck;
private $locations;
public function __construct( Truck $truck, $locations=array() ){
$this->truck=$truck;
$this->locations=$locations;
}
public function display(){
if( !empty( $this->locations ) ){
$dots=str_repeat('-',25);
printf(
"<h2>Trip Routes</h2>
<pre>%s\nTruck: %s\nMax-Weight: %s\n%s\n",
$dots,
$this->truck->get_name(),
$this->truck->get_max_weight(),
$dots
);
$total_locations_weight = 0;
foreach( $this->locations as $index => $location ){
$total_locations_weight += floatval( $location->get_location_weight() );
printf(
"[Drop: %d]\nLocation: %s\nLocation-Weight: %s\n\n",
$index+1,
$location->get_location(),
$location->get_location_weight()
);
}
printf("%s</pre>",$dots);
/* Is there too much weight for the truck? */
if( $total_locations_weight > $this->truck->get_max_weight() ){
printf(
"<pre><h1 style='color:red;margin:0;'>Maximum Weight Exceded</h1><div>Total weight is: %s</div><div>Limit exceded by: %s:</div>\n%s</pre>",
$total_locations_weight,
$total_locations_weight - $this->truck->get_max_weight(),
$dots
);
}
}
}
}
?>
<!DOCTYPE HTML>
<html lang="en">
<head>
<title>Deliveries</title>
</head>
<body class="container">
<form method="post" action="">
<input type="text" name="truck_name" placeholder="Truck Name" value="" required>
<input type="number" name="max_weight" placeholder="Max weight in lbs" value="" required>
<h4>Delivery Locations</h4>
<input type="text" name="location_1" placeholder="Location 1" value="" required>
<input type="number" name="package_1" placeholder="Package weight in lbs" value="" required>
<input type="text" name="location_2" placeholder="Location 2" value="">
<input type="number" name="package_2" placeholder="Package weight in lbs" value="" required>
<input type="text" name="location_3" placeholder="Location 3" value="" required>
<input type="number" name="package_3" placeholder="Package weight in lbs" value="" required>
<input type="submit" name="submit" value="Get Trips">
<input type="reset" name="reset" value="Reset">
</form>
<?php
if( $_SERVER['REQUEST_METHOD']=='POST' && isset( $_POST['submit'] ) ){
$truck_name = filter_input( INPUT_POST, 'truck_name', FILTER_SANITIZE_STRING );
$max_weight = filter_input( INPUT_POST, 'max_weight', FILTER_SANITIZE_STRING );
$location_1 = filter_input( INPUT_POST, 'location_1', FILTER_SANITIZE_STRING );
$location_2 = filter_input( INPUT_POST, 'location_2', FILTER_SANITIZE_STRING );
$location_3 = filter_input( INPUT_POST, 'location_3', FILTER_SANITIZE_STRING );
$package_1 = filter_input( INPUT_POST, 'package_1', FILTER_SANITIZE_STRING );
$package_2 = filter_input( INPUT_POST, 'package_2', FILTER_SANITIZE_STRING );
$package_3 = filter_input( INPUT_POST, 'package_3', FILTER_SANITIZE_STRING );
$truck=new Truck( $truck_name, $max_weight );
$loc_1=new Location( $location_1, $package_1 );
$loc_2=new Location( $location_2, $package_2 );
$loc_3=new Location( $location_3, $package_3 );
$trip=new Trip( $truck, array( $loc_1, $loc_2, $loc_3 ) );
$trip->display();
}
?>
</body>
</html>
在ifisset$_POST['submit']的另一面放置一个else条件，通过这样做，您可以知道是否有成功的POST请求。我没有编辑问题的选项。我还可以如何共享表单html？您可以编辑问题，仔细查看，您会发现链接您的表单是否有action@PraveenPanishetti我添加了else条件，仍然得到空白输出。谢谢。这肯定给了我一个想法，我需要做什么来获得预期的产出。我将很快更新最终结果。再次感谢！我想在一次行程中显示2个位置。比如$trip_1=新trip$truck、$loc_1、$loc_2$跳闸1->显示；我怎样才能用你的代码设置做到这一点？它肯定给了我一个想法，我需要做些什么来获得预期的输出。。。真正地您是否尝试过应用上述任何一项，顺便说一句，这些内容并非旨在成为实际的代码，而是更多的建议，如果是的话，它在哪里？原来的代码是如此的有缺陷，以致于它毫无价值。也许，作为一个建议，您可以提供数组/对象中的许多位置作为Trip类的第二个参数，并处理它？？！？我很清楚你的代码是一个建议。我使用它作为正确实例化函数的指南。下面是我如何使用magic\uuuuu set和\uuuuu get方法设置的。Trip类：类Trip{private$truck；private$location；公共函数{u构造truck$truck，$locs=array{$this->truck=$truck；$this->location=$locs；}}。初始化：$trip_1=新Triparraylocation1=>$loc_1$跳闸1->位置1；我上一个问题措辞不好。我只是想看看我把数组进程弄错了什么地方。对不起，如果最后一条评论听起来有点烦躁-我是。不管怎么说，上面修改过——也许会有帮助，但我可能又错过了重点。
Trip Routes
-------------------------
Truck: The Crushinator
Max-Weight: 2500
-------------------------
[Drop: 1]
Location: London
Location-Weight: 1500
[Drop: 2]
Location: Glasgow
Location-Weight: 1500
[Drop: 3]
Location: Edinburgh
Location-Weight: 550
-------------------------
Maximum Weight Exceded
Total weight is: 3550
Limit exceded by: 1050:
-------------------------