PHP教學-表單驗證 - 驗證 E-mail 和 URL
PHP - 驗證名字
以下程式碼展示的簡單方法檢查 name 字段是否包含字母和空格。如果 name 字段無效,則存儲一條錯誤消息:
$name = test_input($_POST["name"]); if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "只允許字母和空格!"; }
註釋:preg_match() 函數檢索字串的模式,如果模式存在則返回 true,否則返回 false。
PHP - 驗證 E-mail
PHP - 驗證 E-mail
以下程式碼展示的簡單方法檢查 e-mail 地址語法是否有效。如果無效則存儲一條錯誤消息:
$name = test_input($_POST["name"]); if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "只允許字母和空格!"; }
PHP - 驗證 URL
以下程式碼展示的方法檢查 URL 地址語法是否有效(這條正則表達式同時允許 URL 中的斜槓)。如果 URL 地址語法無效,則存儲一條錯誤消息:
$name = test_input($_POST["name"]); if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "只允許字母和空格!"; }
PHP - 驗證 Name、E-mail、以及 URL
現在,scripts是這樣的:
範例
範例
<?php // 定義變數並設置為空值 $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"]); // 檢查名字是否包含字母和空格 if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "Only letters and white space allowed"; } } if (empty($_POST["email"])) { $emailErr = "Email is required"; } else { $email = test_input($_POST["email"]); // 檢查電郵地址語法是否有效 if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) { $emailErr = "Invalid email format"; } } if (empty($_POST["website"])) { $website = ""; } else { $website = test_input($_POST["website"]); // 檢查 URL 地址語言是否有效(此正則表達式同樣允許 URL 中的下劃線) 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 = "Gender is required"; } else { $gender = test_input($_POST["gender"]); } } ?>
完整範例
<!DOCTYPE HTML> <html> <head> <style> .error {color: #FF0000;} </style> </head> <body> <?php // 定義變數並設置為空值 $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"]); // 檢查姓名是否包含字母和空白字符 if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "只允許字母和空格"; } } if (empty($_POST["email"])) { $emailErr = "電郵是必填的"; } else { $email = test_input($_POST["email"]); // 檢查電子郵件地址語法是否有效 if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) { $emailErr = "無效的 email 格式"; } } if (empty($_POST["website"])) { $website = ""; } else { $website = test_input($_POST["website"]); // 檢查 URL 地址語法是否有效(正則表達式也允許 URL 中的斜槓) if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) { $websiteErr = "無效的 URL"; } } if (empty($_POST["comment"])) { $comment = ""; } else { $comment = test_input($_POST["comment"]); } if (empty($_POST["gender"])) { $genderErr = "性別是必選的"; } else { $gender = test_input($_POST["gender"]); } } function test_input($data) { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); return $data; } ?> <h2>PHP 驗證範例</h2> <p><span class="error">* 必需的字段</span></p> <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 姓名:<input type="text" name="name"> <span class="error">* <?php echo $nameErr;?></span> <br><br> 電郵:<input type="text" name="email"> <span class="error">* <?php echo $emailErr;?></span> <br><br> 網址:<input type="text" name="website"> <span class="error"><?php echo $websiteErr;?></span> <br><br> 評論:<textarea name="comment" rows="5" cols="40"></textarea> <br><br> 性別: <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>您的輸入:</h2>"; echo $name; echo "<br>"; echo $email; echo "<br>"; echo $website; echo "<br>"; echo $comment; echo "<br>"; echo $gender; ?> </body> </html>
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