​x
 
<!DOCTYPE HTML>  
<html>
<head>
</head>
<body>  
​
<?php
// 定义变量并设置为空值
$name = $email = $gender = $comment = $website = "";
​
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  $name = test_input($_POST["name"]);
  $email = test_input($_POST["email"]);
  $website = test_input($_POST["website"]);
  $comment = test_input($_POST["comment"]);
  $gender = test_input($_POST["gender"]);
}
​
function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
?>
​
<h2>PHP 表单验证示例</h2>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">  
  姓名: <input type="text" name="name">
  <br><br>
  邮箱: <input type="text" name="email">
  <br><br>
  网站: <input type="text" name="website">
  <br><br>
  评论: <textarea name="comment" rows="5" cols="40">


性别: 女 男 其他

您的输入："; echo $name; echo "
"; echo $email; echo "
"; echo $website; echo "
"; echo $comment; echo "
"; echo $gender; ?>