​x
 
<!DOCTYPE HTML> 
<html>
<head>
</head>
<body> 
​
<?php
// define variables and set to empty values
$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 $data;
}
?>
​
<h2>PHP 验证实例</h2>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 
   姓名：<input type="text" name="name">
   <br><br>
   电邮：<input type="text" name="email">
   <br><br>
   网址：<input type="text" name="website">
   <br><br>
   评论：<textarea name="comment" rows="5" cols="40">


性别： 女性 男性

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