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表单验证实例
<!DOCTYPE HTML><html><head> <style> .error { color: #FF0000; } </style></head><body> <?php // 定义变量并设置为空值 $nameErr = $emailErr = $genderErr = $websiteErr = null; $name = $email = $gender = $comment = $website = null; if ($_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>表单验证实例
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