PHP 联系表单

2025年5月3日 | 阅读4分钟

在本节中，我们将通过一些示例创建一个 PHP 联系表单。在学习高级概念之前，我们先理解 PHP 和联系表单的基础知识。我们将使用传统的方法来实现验证，并为最终用户创造一种流畅的体验。

PHP 联系表单是什么意思？

联系表单或 PHP 中的网页表单是每个网站与访问者互动和联系的重要工具。它响应迅速，可在各种设备上运行，例如手机、平板电脑等。此表单包含许多选项，例如电子邮件、电话号码等。

让我们以 PHP 联系表单为例。

示例

<!DOCTYPE html>    
<html lang="en">    
<head>  
    <meta charset="utf-8">  
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">  
    <title> PHP Contact Form Example </title>  
    
    <!-- Internal CSS styling for form elements -->
    <style>  
        /* Styling error messages */
        .error {  
            color: red;  
            font-weight: 400;  
            display: block;  
            padding: 6px 0;  
            font-size: 14px;  
        }  
        
        /* Styling the form box */
        form {  
            border: 1px solid #1A33FF;  
            background: #ecf5fc;  
            padding: 40px 50px 45px;  
        }  
        
        /* Styling the main heading */
        h2 {  
            font-style: italic;  
            font-family: "Playfair Display","Bookman",serif;  
            color: #999;   
            letter-spacing: -0.005em;   
            word-spacing: 1px;  
            font-size: 1.75em;  
            font-weight: bold;  
        }  

        /* Styling text inputs */
        input[type="text"] {  
            font: 15px/24px "Lato", Arial, sans-serif;   
            color: #333;   
            width: 100%;   
            box-sizing: border-box;   
            letter-spacing: 1px;  
        }  
        
        /* Styling the select (dropdown) */
        select:hover {  
            color: #000000;  
            background-color: white;  
        }  
        
        select {  
            width: 100%;  
            height: 50px;  
            font-size: 100%;  
            font-weight: bold;  
            cursor: pointer;  
            border: 2px solid #1A33FF;  
            border-radius: 4px;  
            padding: 8px 38px 10px 18px;  
            appearance: none;  
            -webkit-appearance: none;  
            -moz-appearance: none;  
            transition: color 0.3s ease, background-color 0.3s ease, border-bottom-color 0.3s ease;  
        }  
        
        /* General page styling */
        body {    
            text-align: center;    
            background: #ecf5fc;   
        }    

        /* Main page title styling */
        h1 {  
            margin: 10 auto;  
            font-family: 'Lily Script One', cursive;  
            font-size: 40px;  
            font-weight: bold;  
            text-align: center;  
            color: gray;  
            transition: 0.2s ease all;  
        }  
        
        h1:hover {  
            color: cornflowerblue;  
        }  

        /* Submit button styling */
        input[type=submit] {  
            border: 3px solid;  
            border-radius: 2px;  
            display: block;  
            font-size: 1em;  
            font-weight: bold;  
            margin: 1em auto;  
            padding: 1em 4em;  
            position: relative;  
            text-transform: uppercase;  
        }  

        input[type=submit]::before, input[type=submit]::after {  
            background: #fff;  
            content: '';  
            position: absolute;  
            z-index: -1;  
        }  

        input[type=submit]:hover {  
            color: #1A33FF;  
        }  
    </style>  
</head>  

<body>   

<?php  
// Initialize variables and error messages
$nameErr = $emailErr = $genderErr = $websiteErr = "";  
$name = $email = $gender = $Number = $message = $subject = "";  

// Check if the form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {  
    
    // Validate Name
    if (empty($_POST["name"])) {  
        $nameErr = "Name is required";  
    } else {  
        $name = test_input($_POST["name"]);  
    }  
    
    // Validate Email
    if (empty($_POST["email"])) {  
        $emailErr = "Email is required";  
    } else {  
        $email = test_input($_POST["email"]);  
        // Check for valid email format
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {  
            $emailErr = "Invalid email format";   
        }  
    }  
    
    // Validate Phone Number
    if (empty($_POST["course"])) {  
        $Number = "";  
    } else {  
        $Number = test_input($_POST["course"]);  
    }  
    
    // Validate Message
    if (empty($_POST["class"])) {  
        $message = "";  
    } else {  
        $message = test_input($_POST["class"]);  
    }  
    
    // Validate Gender
    if (empty($_POST["gender"])) {  
        $genderErr = "Gender is required";  
    } else {  
        $gender = test_input($_POST["gender"]);  
    }  
    
    // Validate City Selection
    if (empty($_POST["subject"])) {  
        $subjectErr = "You must select 1 or more";  
    } else {  
        $subject = $_POST["subject"];      
    }  
}  

// Function to clean and secure user input
function test_input($data) {  
    $data = trim($data);  
    $data = stripslashes($data);  
    $data = htmlspecialchars($data);  
    return $data;  
}  
?>    

<!-- Contact Form -->
<form method="POST" align="center" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">  
    <h1> PHP Contact Form Example </h1>   
    <table align="center">  
        <!-- Name input field -->
        <tr>  
            <td><b> Enter Your Name: </b></td>  
            <td> 
                <input type="text" name="name" placeholder="Type in your username..">  
                <span class="error"> * <?php echo $nameErr;?> </span>  
            </td>  
        </tr>  

        <!-- Email input field -->
        <tr>  
            <td><b> Enter E-mail Address: </b></td>  
            <td> 
                <input type="text" name="email" placeholder="Type in your E-mail..">  
                <span class="error"> * <?php echo $emailErr;?> </span>  
            </td>  
        </tr>  

        <!-- Phone number input field -->
        <tr>  
            <td><b> Enter Phone Number: </b></td>  
            <td> 
                <input type="text" name="course" placeholder="Type in your Number..">  
                <span class="error"><?php echo $websiteErr;?></span>  
            </td>  
        </tr>  

        <!-- Message field -->
        <tr>  
            <td><b> Message </b></td>  
            <td> 
                <textarea name="class" rows="5" cols="40">Write your Message here</textarea> 
            </td>  
        </tr>  

        <!-- Gender selection radio buttons -->
        <tr>  
            <td><b> Select Gender: </b></td>  
            <td>  
                <input type="radio" name="gender" value="yes"> <label for="gender"> Male </label><br>  
                <input type="radio" name="gender" value="no"> <label for="gender"> Female </label><br>  
                <input type="radio" name="gender" value="no"> <label for="gender"> Transgender </label>   
                <span class="error"> * <?php echo $genderErr;?> </span>  
            </td>  
        </tr>  

        <!-- City selection dropdown -->
        <tr>  
            <td><b> Select City: </b></td>  
            <td>  
                <select name="city[]" size="4" multiple>  
                    <option value="Agra">Agra</option>  
                    <option value="Jamshedpur">Jamshedpur</option>  
                    <option value="Chandigarh">Chandigarh</option>  
                    <option value="Delhi">Delhi</option>  
                    <option value="Hyderabad">Hyderabad</option>  
                    <option value="Varanasi">Varanasi</option>  
                </select>  
            </td>  
        </tr>  

        <!-- Terms and conditions checkbox -->
        <tr>  
            <td><b> I have Agree the terms and conditions </b></td>  
            <td><input type="checkbox" name="checked" value="1"></td>  
        </tr>  

        <!-- Submit button -->
        <tr>  
            <td>  
                <input type="submit" name="submit" value="Submit">   
            </td>  
        </tr>  
    </table>  
</form>  

<!-- Display the submitted form data -->
<?php  
    echo "<h2>Your given values are:</h2>";  
    echo "<p>Your name is: $name</p>";  
    echo "<p>Your email address is: $email</p>";  
    echo "<p>Your Phone Number is: $Number</p>";  
    echo "<p>Your message info: $message</p>";  
    echo "<p>Your gender is: $gender</p>";   

    // Loop through selected subjects (cities)
    if (!empty($subject)) {
        for($i = 0; $i < count($subject); $i++) {  
            echo $subject[$i] . " ";  
        }
    }
?>  

</body>  
</html>  

输出

如果我们不填写任何信息就点击提交按钮，它将表明这些是必填字段；您无法在未填写准确信息的情况下提交表单。上图是输出部分显示错误的截图。

填写必填字段后，我们再次尝试提交表单，但现在没有遇到任何错误，因为所有必填字段都已用正确信息填写，如您在上图提供的输出部分截图中看到的。

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