w3c 在线测试代码编辑

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

<code class="phpcode"><?php
// 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 = "姓名是必填的";
   } else {
     $name = test_input($_POST["name"]);
   }
   
   if (empty($_POST["email"])) {
     $emailErr = "电邮是必填的";
   } else {
     $email = test_input($_POST["email"]);
   }
     
   if (empty($_POST["website"])) {
     $website = "";
   } else {
     $website = test_input($_POST["website"]);
   }

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;
}
?></code>

<h2>PHP 验证实例</h2>
<p><span class="error">* 必需的字段</span></p>
<form method="post" action="<code class="phpcode"><?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?></code>"> 
   姓名：<input type="text" name="name">
   <span class="error">* <code class="phpcode"><?php echo $nameErr;?></code></span>
   <br><br>
   电邮：<input type="text" name="email">
   <span class="error">* <code class="phpcode"><?php echo $emailErr;?></code></span>
   <br><br>
   网址：<input type="text" name="website">
   <span class="error"><code class="phpcode"><?php echo $websiteErr;?></code></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">* <code class="phpcode"><?php echo $genderErr;?></code></span>
   <br><br>
   <input type="submit" name="submit" value="提交"> 
</form>

<code class="phpcode"><?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;
?></code>

</body>
</html>

查看结果：