PHP表單驗證執行個體的代碼

最後更新：2018-07-18 來源：互聯網

上載者：User

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這篇文章給大家介紹的內容是關於PHP表單驗證的例子，有需要的朋友可以參考一下。

<!DOCTYPE HTML> <html><head><style>.error {color: #FF0000;}</style></head><body> <?php// 定義變數並設定為空白值$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"]);     // 檢查名稱是否包含字母和空白字元     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"]);     // 檢查電子郵件地址文法是否有效     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 地址文法是否有效（Regex也允許 URL 中的斜杠）     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 $data;}?><h2>PHP 驗證執行個體</h2><p><span class="error">* 必需的欄位</span></p><form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">    姓名：<input type="text" name="name" value="<?php echo $name;?>">   <span class="error">* <?php echo $nameErr;?></span>   <br><br>   電郵：<input type="text" name="email" value="<?php echo $email;?>">   <span class="error">* <?php echo $emailErr;?></span>   <br><br>   網址：<input type="text" name="website" value="<?php echo $website;?>">   <span class="error"><?php echo $websiteErr;?></span>   <br><br>   評論：<textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>   <br><br>   性別：   <input type="radio" name="gender"   <?php if (isset($gender) && $gender=="female") echo "checked";?>   value="female">女性   <input type="radio" name="gender"   <?php if (isset($gender) && $gender=="male") echo "checked";?>    value="male">男性   <span class="error">* <?php echo $genderErr;?></span>   <br><br>   <input type="submit" name="submit" value="提交"> </form><?phpecho "<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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