我的 php 代码不能与 HTML 一起运行有什么原因吗？
我现在正在练习 php 解决一个简单的 Web 表单问题。长话短说，我只需要创建一个非常基本的 Web 表单，该表单接受欧洲城市的二维数组，以公里为单位显示它与其他欧洲城市的距离。我需要做的就是创建一个 Web 表单，您可以在其中输入在该二维数组中找到的任何城市，并让它计算起始城市和结束城市之间的距离（即，在输入“柏林”和“布拉格”在文本字段中。
我想我的问题几乎解决了，但问题是 phpstorm 告诉我某些变量未定义，即使它们已经在我的函数中定义并且在该函数之前作为变量。如果这个问题看起来微不足道，我深表歉意，但我目前只是在学习消化 php。下面是我的代码。我在一页中包含了 html 和 php 代码。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Distance between European Cities</title>
</head>
<body>
<h1>Distance between European Cities</h1>
<h2>Enter valid European cities from this list: Berlin, Moscow, Paris, Prague, Rome</h2>
<?php
$Distances = array(
"Berlin" => array("Berlin" => 0, "Moscow" => 1607.99, "Paris" => 876.96, "Prague" => 280.34, "Rome" => 1181.67),
"Moscow" => array("Berlin" => 1607.99, "Moscow" => 0, "Paris" => 2484.92, "Prague" => 1664.04, "Rome" => 2374.26),
"Paris" => array("Berlin" => 876.96, "Moscow" => 641.34, "Paris" => 0, "Prague" => 885.38, "Rome" => 1105.76),
"Prague" => array("Berlin" => 280.34, "Moscow" => 1607.99, "Paris" => 885.38, "Prague" => 0, "Rome" => 922),
"Rome" => array("Berlin" => 1181.67, "Moscow" => 2374.26, "Paris" => 1105.76, "Prague" => 922, "Rome" => 0));
$KMtoMiles = 0.62;
$City1 = $_POST['firstCity'];
$City2 = $_POST['secondCity'];
function euDis($City1, $City2, $Distances){
if (empty($City1) || empty($City2)) {
echo "Please input two cities in the required fields.<br />\n";
} elseif (in_array($City1, $Distances) == FALSE || in_array($City2, $Distances) == FALSE) {
echo "You inputted one or more cities that are not in our list.<br />";
} else {
if (isset($_POST['submit'])) {
$City1 = stripslashes($_POST['firstCity']);
$City2 = stripslashes($_POST['secondCity']);
if (isset($Distances[$City1][$City2])) {
echo "<p>The distance from $City1 to $City2 is " . $Distances[$City1][$City2] . " kilometers or " . round((0.62 * $Distances[$City1][$City2]), 2) . " miles.</p>\n";
}
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