PHP 表单验证
Posted xsr7yer
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代码:
<html> <?php // PHP - 验证Name、E-mail、以及URL // 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 = "Name is required"; } else { $name = test_input($_POST["name"]); // 检查名字是否包含字母和空格 if (!preg_match("/^[a-z-A-z]*$/", $name)) { $nameErr = "Only letters and white space allowed"; } } if (empty($_POST["email"])) { $emailErr = "Email is requied"; // 检查电邮语法是否有效 if (!preg_match("/([\\w\\-]+\\@[\\w\\-]+\\.[\\w\\-]+)/", $email)) { $emailErr = "Invalid email format"; } } if (empty($_POST["website"])) { $website = ""; } else { $website = test_input($_POST["website"]); // 检查URL地址语言是否有效(此正则表达式同样允许URL中的下划线) if (!preg_match("/\\b(?:(?:https?|ftp):\\/\\/|www\\.)[-a-z0-9+&@#\\/%?=~_|!:,.;]*[-a-z0-9+&@#\\/%=~_|]/i", $website)) { $websiteErr = "Invalid URL"; } } if (empty($_POST["comment"])) { $comment = ""; } else { $comment = test_input($_POST["comment"]); } if (empty($_POST["gender"])) { $genderErr = "Gander is required"; } else { $gender = test_input($_POST["gender"]); } } function test_input($data) { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); return $data; } ?> <head> <title>PHP 表单验证</title> </head> <body> <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> Name: <input type="text" name="name"> <span class="error">* <?php echo $nameErr;?></span> <br><br> E-mail: <input type="text" name="email"> <span class="error">* <?php echo $emailErr;?></span> <br><br> Website: <input type="text" name="website"> <span class="error"><?php echo $websiteErr;?></span> <br><br> <label>Comment: <textarea name="comment" rows="5" cols="40"></textarea> <br><br> Gender: <input type="radio" name="gender" value="female">Female <input type="radio" name="gender" value="male">Male <span class="error">* <?php echo $genderErr;?></span> <br><br> <input type="submit" name="submit" value="Submit"> </form> </body> </html>
回显:
存在问题:等深入了解以后再瞅瞅,现在一直看不出哪里出问题了,正则表达式不是很懂,几乎是照本搬科。
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