三体教程(santii.com)

.error {color: #FF0000;}

// 定义变量并默认设置为空值

$nameErr = $emailErr = $genderErr = $websiteErr = "";

$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST")

{

if (empty($_POST["name"]))

{

$nameErr = "名字是必需的";

}

else

{

$name = test_input($_POST["name"]);

// 检测名字是否只包含字母跟空格

if (!preg_match("/^[a-zA-Z ]*$/",$name))

{

$nameErr = "只允许字母和空格";

}

}

if (empty($_POST["email"]))

{

$emailErr = "邮箱是必需的";

}

else

{

$email = test_input($_POST["email"]);

// 检测邮箱是否合法

if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))

{

$emailErr = "非法邮箱格式";

}

}

if (empty($_POST["website"]))

{

$website = "";

}

else

{

$website = test_input($_POST["website"]);

// 检测 URL 地址是否合法

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

{

$websiteErr = "非法的 URL 的地址";

}

}

if (empty($_POST["comment"]))

{

$comment = "";

}

else

{

$comment = test_input($_POST["comment"]);

}

if (empty($_POST["gender"]))

{

$genderErr = "性别是必需的";

}

else

{

$gender = test_input($_POST["gender"]);

}

}

function test_input($data)

{

$data = trim($data);

$data = stripslashes($data);

$data = htmlspecialchars($data);

return $data;

}

?>

PHP 表单验证实例

* 必需字段。

">

名字:

* <?php echo $nameErr;?>

E-mail:

* <?php echo $emailErr;?>

网址:

备注: <?php echo $comment;?>

性别:

value="female">女

value="male">男

* <?php echo $genderErr;?>

echo "

您输入的内容是:

";

echo $name;

echo "
";

echo $email;

echo "
";

echo $website;

echo "
";

echo $comment;

echo "
";

echo $gender;

?>