<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> <style> .error {color: #FF0000;} </style> </head> <body> <?php // 定义变量并默认设置为空值 $nameErr = $emailErr = $genderErr = $websiteErr = ""; $name = $email = $gender = $comment = $website = ""; if ($_SERVER["REQUEST_METHOD"] == "POST") { if (empty($_POST["name"])) { $nameErr = "名字是必需的"; } else { $name = test_input($_POST["name"]); // 检测名字是否只包含字母跟空格 if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "只允许字母和空格"; } } if (empty($_POST["email"])) { $emailErr = "邮箱是必需的"; } else { $email = test_input($_POST["email"]); // 检测邮箱是否合法 if (!preg_match("/([w-]+@[w-]+.[w-]+)/",$email)) { $emailErr = "非法邮箱格式"; } } if (empty($_POST["website"])) { $website = ""; } else { $website = test_input($_POST["website"]); // 检测 URL 地址是否合法 if (!preg_match("/(?:(?:https?|ftp)://|www.)[-a-z0-9+&@#/%?=~_|!:,.;]*[-a-z0-9+&@#/%=~_|]/i",$website)) { $websiteErr = "非法的 URL 的地址"; } } if (empty($_POST["comment"])) { $comment = ""; } else { $comment = test_input($_POST["comment"]); } if (empty($_POST["gender"])) { $genderErr = "性别是必需的"; } else { $gender = test_input($_POST["gender"]); } } function test_input($data) { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); return $data; } ?> <h2>PHP 表单验证实例</h2> <p><span class="error">* 必需字段。</span></p> <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 名字: <input type="text" name="name" value="<?php echo $name;?>"> <span class="error">* <?php echo $nameErr;?></span> <br><br> E-mail: <input type="text" name="email" value="<?php echo $email;?>"> <span class="error">* <?php echo $emailErr;?></span> <br><br> 网址: <input type="text" name="website" value="<?php echo $website;?>"> <span class="error"><?php echo $websiteErr;?></span> <br><br> 备注: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea> <br><br> 性别: <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">女 <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">男 <span class="error">* <?php echo $genderErr;?></span> <br><br> <input type="submit" name="submit" value="Submit"> </form> <?php echo "<h2>您输入的内容是:</h2>"; echo $name; echo "<br>"; echo $email; echo "<br>"; echo $website; echo "<br>"; echo $comment; echo "<br>"; echo $gender; ?> </body> </html>
“名字”: <input type="text" name="name"> E-mail: <input type="text" name="email"> 网址: <input type="text" name="website"> 备注: <textarea name="comment" rows="5" cols="40"></textarea>
性别: <input type="radio" name="gender" value="female">女 <input type="radio" name="gender" value="male">男
<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <?php // 定义变量并默认设置为空值 $name = $email = $gender = $comment = $website = ""; if ($_SERVER["REQUEST_METHOD"] == "POST") { $name = test_input($_POST["name"]); $email = test_input($_POST["email"]); $website = test_input($_POST["website"]); $comment = test_input($_POST["comment"]); $gender = test_input($_POST["gender"]); } function test_input($data) { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); return $data; } ?> <h2>PHP 表单验证实例</h2> <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 名字: <input type="text" name="name"> <br><br> E-mail: <input type="text" name="email"> <br><br> 网址: <input type="text" name="website"> <br><br> 备注: <textarea name="comment" rows="5" cols="40"></textarea> <br><br> 性别: <input type="radio" name="gender" value="female">女 <input type="radio" name="gender" value="male">男 <br><br> <input type="submit" name="submit" value="Submit"> </form> <?php echo "<h2>您输入的内容是:</h2>"; echo $name; echo "<br>"; echo $email; echo "<br>"; echo $website; echo "<br>"; echo $comment; echo "<br>"; echo $gender; ?> </body>
