<!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("/\b(?:(?: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
原文:http://www.cnblogs.com/boonya/p/5054723.html