php基本(四)表單驗證

本文內容來自http://www.w3school.com.cn/php/php_form_url_email.aspphp

PHP 表單驗證 - 驗證 E-mail 和 URL

本節展現如何驗證名字、電郵和 URL。html

PHP - 驗證名字

如下代碼展現的簡單方法檢查 name 字段是否包含字母和空格。若是 name 字段無效,則存儲一條錯誤消息:web

$name = test_input($_POST["name"]); if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "只容許字母和空格!"; }

註釋:preg_match() 函數檢索字符串的模式,若是模式存在則返回 true,不然返回 false。正則表達式

PHP - 驗證 E-mail

如下代碼展現的簡單方法檢查 e-mail 地址語法是否有效。若是無效則存儲一條錯誤消息:函數

$email = test_input($_POST["email"]); if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) { $emailErr = "無效的 email 格式!"; }

PHP - 驗證 URLpost

如下代碼展現的方法檢查 URL 地址語法是否有效(這條正則表達式同時容許 URL 中的斜槓)。若是 URL 地址語法無效,則存儲一條錯誤消息:url

$website = test_input($_POST["website"]); if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/% =~_|]/i",$website)) { $websiteErr = "無效的 URL"; }

 

PHP驗證明例

<!DOCTYPE HTML> 
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body> 



<h2>PHP 驗證明例</h2>
<p><span class="error">* 必需的字段</span></p>
<form method="post" action=""> 
   姓名:<input type="text" name="name">
   <span class="error">* </span>
   <br><br>
   電郵:<input type="text" name="email">
   <span class="error">* </span>
   <br><br>
   網址:<input type="text" name="website">
   <span class="error"></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">* </span>
   <br><br>
   <input type="submit" name="submit" value="提交"> 
</form>



</body>
</html><?php
// 定義變量並設置爲空值
$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 = "只容許字母和空格"; 
     }
   }
   
   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(正則表達式也容許 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 $data;
}
?><?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?><?php echo $nameErr;?><?php echo $emailErr;?><?php echo $websiteErr;?><?php echo $genderErr;?><?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;
?>
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