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为什么我的PHP代码无法与HTML一起运行？

[英]Is there a reason why my php code won't run with the HTML?

 原文  2019-07-14 02:04:54  7   3    php/ html

问题描述

我现在正在通过一个简单的Web表单问题练习php。 长话短说，我只需要创建一个非常基本的Web表单即可使用二维数组的欧洲城市，这些表单以公里为单位显示距其他欧洲城市的距离。 我需要做的就是创建一个网络表单，您可以在其中输入在两维数组中找到的任何城市，并计算起点城市和终点城市之间的距离（即输入“文本字段中的“柏林”和“布拉格”。

我认为我的问题已基本解决，但问题是phpstorm告诉我某些变量是未定义的，即使它们已在我的函数中定义且在该函数之前已定义为变量。 如果这个问题看起来微不足道，我深表歉意，但是我现在正在学习摘要php。 这是下面的代码。 我在一页中包含了html和php代码。 

<!DOCTYPE html>
<html lang="en">
<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][$City2]), 2) . " miles.</p>\n";
        } else {
            echo "<p>$City1 and $City2 are not in this list.</p>\n";
        }
    }
}
}
?>
<form action= "eudistance.php" method="post">

City 1: <input type="text" name="firstCity" /><br />

City 2: <input type="text" name="secondCity" /><br />

<input type="reset" value="Clear All" />

<input type="submit" name="submit" value="Enter" />

</form>
</body>
</html>

3 个解决方案

解决方案1
 1  2019-07-14 02:23:47

我改变了以下事情。

  1. 您没有调用函数。
  2. 城市名称是阵列的keys 。 如果您的变量是数组的成员，而不是键，则in_array返回true 。 
<?php
function euDis($City1, $City2){

    $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));

    if (empty(trim($City1)) || empty(trim($City2))) {
        echo "Please input two cities in the required fields.<br />";
    } elseif ($Distances[$City1] == null || $Distances[$City2] == null) {
        echo "You inputted one or more cities that are not in our list.<br />";
    } else {
        if (isset($Distances[$City1][$City2])) {
            echo "<p>The distance from $City1 to $City2 is " . $Distances[$City1][$City2] . " kilometers or " . round((0.62 * $Distances[$City1][$City2]), 2) . " miles.</p>";
        } else {
            echo "<p>$City1 and $City2 are not in this list.</p>";
        }
    }
}
?>

<!DOCTYPE html>
<html lang="en">
<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

if($_POST)
{

euDis($_POST['firstCity'], $_POST['secondCity']);


}


?>
<form action= "" method="post">

City 1: <input type="text" name="firstCity" /><br />

City 2: <input type="text" name="secondCity" /><br />

<input type="reset" value="Clear All" />

<input type="submit" name="submit" value="Enter" />

</form>
</body>
</html>

解决方案2
 0  2019-07-14 02:13:16

您的php代码首先执行，因此您遇到了一些错误。 只需添加 

if(isset($_POST['submit'])){
...
}

在您的php代码中，这样您的php代码将仅在提交表单详细信息后执行。 

$City1 = $_POST['firstCity'];
$City2 = $_POST['secondCity'];

上面的两个变量没有初始化，它们是从表单获取值，因此在执行php代码之前需要提交表单数据。 并且您应该调用该函数来计算距离。

函数调用： 

if(isset($_POST['submit']))
{
$KMtoMiles = 0.62;
$City1 = $_POST['firstCity'];
$City2 = $_POST['secondCity'];
euDis(trim($City1),trim($City2));  //function calling
}

像这样： 

<!DOCTYPE html>
<html lang="en">
<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
if(isset($_POST['submit']))
{
$KMtoMiles = 0.62;
$City1 = $_POST['firstCity'];
$City2 = $_POST['secondCity'];
euDis(trim($City1),trim($City2));
}
function euDis($City1, $City2){
$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));


if (empty(trim($City1)) || empty(trim($City2)))  {
    echo "Please input two cities in the required fields.<br />\n";
} 
 else {
        if (isset($Distances[$City1][$City2])) {
            echo "<p>The distance from $City1 to $City2 is " . $Distances[$City1][$City2] . " kilometers or " . round((0.62 * $Distances[$City1][$City2]), 2) . " miles.</p>\n";} 
        else {
            echo "<p>$City1 and $City2 are not in this list.</p>\n";
        }    }
}
?>

<form action= "" method="post">

City 1: <input type="text" name="firstCity" /><br />

City 2: <input type="text" name="secondCity" /><br />

<input type="reset" value="Clear All" />

<input type="submit" name="submit" value="Enter" />

</form>
</body>
</html>

解决方案3
 0  2019-07-14 02:39:56

代码中有两个问题。第一个是在分配发布变量之前检查数据是否可用。 第二个是距离数组中可用的城市。

解决了您的问题。 尝试一次此代码 

<!DOCTYPE html>
<html lang="en">
<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));
$KMtoMiles = 0.62;
if(isset($_POST['submit'])){
    $City1 = $_POST['firstCity'];
    $City2 = $_POST['secondCity'];

    if (empty($City1) || empty($City2)) {
        echo "Please input two cities in the required fields.<br />\n";
    } elseif (is_array($Distances[$City1]) == False || is_array($Distances[$City2])== 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][$City2]), 2) . " miles.</p>\n";
            } else {
                echo "<p>$City1 and $City2 are not in this list.</p>\n";
            }
        }
    }

}
?>
<form action= "" method="post">

City 1: <input type="text" name="firstCity" /><br />

City 2: <input type="text" name="secondCity" /><br />

<input type="reset" value="Clear All" />

<input type="submit" name="submit" value="Enter" />

</form>
</body>
</html>

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