• PhpForm表单验证


    <!DOCTYPE HTML>
    <html>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <head>
    <style>
    .error {
        color: #FF0000;
    }
    </style>
    </head>
    <body>
    
        <?php
     // 定义变量并设置为空值
    $nameErr = $emailErr = $genderErr = $websiteErr = "";
    $name = $email = $gender = $comment = $website = "";
    
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
       if (empty($_POST["name"])) {
         $nameErr = "姓名是必填的";
       } else {
         $name = test_input($_POST["name"]);
         // 检查姓名是否包含字母和空白字符
         if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
           $nameErr = "只允许字母和空格"; 
         }
       }
       
       if (empty($_POST["email"])) {
         $emailErr = "电邮是必填的";
       } else {
         $email = test_input($_POST["email"]);
         // 检查电子邮件地址语法是否有效
         if (!preg_match("/([w-]+@[w-]+.[w-]+)/",$email)) {
           $emailErr = "无效的 email 格式"; 
         }
       }
         
       if (empty($_POST["website"])) {
         $website = "";
       } else {
         $website = test_input($_POST["website"]);
         // 检查 URL 地址语法是否有效(正则表达式也允许 URL 中的斜杠)
         if (!preg_match("/(?:(?:https?|ftp)://|www.)[-a-z0-9+&@#/%?=~_|!:,.;]*[-a-z0-9+&@#/%=~_|]/i",$website)) {
           $websiteErr = "无效的 URL"; 
         }
       }
    
       if (empty($_POST["comment"])) {
         $comment = "";
       } else {
         $comment = test_input($_POST["comment"]);
       }
    
       if (empty($_POST["gender"])) {
         $genderErr = "性别是必选的";
       } else {
         $gender = test_input($_POST["gender"]);
       }
    }
    
    function test_input($data) {
       $data = trim($data);
       $data = stripslashes($data);
       $data = htmlspecialchars($data);
       return $data;
    }
    ?>
    
        <h2>PHP 验证实例</h2>
        <p>
            <span class="error">* 必需的字段</span>
        </p>
        <form method="post" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>"> 
            姓名:<input type="text" name="name"> <span class="error">*
                <?php echo $nameErr;?>
            </span> <br>
            <br> 电邮:<input type="text" name="email"> <span
                class="error">* <?php echo $emailErr;?></span> <br>
            <br> 网址:<input type="text" name="website"> <span
                class="error">
                <?php echo $websiteErr;?>
            </span> <br>
            <br> 评论:
            <textarea name="comment" rows="5" cols="40"></textarea>
            <br>
            <br> 性别: <input type="radio" name="gender" value="female">女性
            <input type="radio" name="gender" value="male">男性 <span
                class="error">* <?php echo $genderErr;?></span> <br>
            <br> <input type="submit" name="submit" value="提交">
        </form>
    
        <?php
    echo "<h2>您的输入:</h2>";
    echo $name;
    echo "<br>";
    echo $email;
    echo "<br>";
    echo $website;
    echo "<br>";
    echo $comment;
    echo "<br>";
    echo $gender;
    ?>
    
    </body>
    </html>

    From:http://www.w3school.com.cn/php/php_form_complete.asp

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  • 原文地址:https://www.cnblogs.com/boonya/p/5054723.html
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