防止多个PHP表单提交_PHP教程

/* Set e-mail recipient */
$myemail = "you@domain.com";

/* Check all form inputs using check_input function */
$yourname = check_input($_POST['yourname'], "Enter your name");
$subject = check_input($_POST['subject'], "Write a subject");
$email = check_input($_POST['email']);
$website = check_input($_POST['website']);
$likeit = check_input($_POST['likeit']);
$how_find = check_input($_POST['how']);
$comments = check_input($_POST['comments'], "Write your comments");
//www.software8.co 原文
/* If e-mail is not valid show error message */
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $email))
{
show_error("E-mail address not valid");
}

/* If URL is not valid set $website to empty */
if (!preg_match("/^(https?:\/\/+[\w\-]+\.[\w\-]+)/i", $website))
{
$website = '';
}

/* Let's prepare the message for the e-mail */
$message = "Hello!

Your contact form has been submitted by:

Name: $yourname
E-mail: $email
URL: $website

Like the website? $likeit
How did he/she find it? $how_find

Comments:
$comments

End of message
";

/* Send the message using mail() function */
mail($myemail, $subject, $message);

/* Set a cookie to prevent duplicate submissions */
setcookie('FormSubmitted', '1');

/* Redirect visitor to the thank you page */
header('Location: thanks.htm');
exit();

/* Functions we used */
function check_input($data, $problem='')
{
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
if ($problem && strlen($data) == 0)
{
show_error($problem);
}
return $data;
}

function show_error($myError)
{
?>

Please correct the following error:

exit();
}
?

http://www.bkjia.com/PHPjc/477927.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/477927.htmlTechArticle当提交一个HTML表单，它可能需要几秒钟前成功提交，并显示响应页面的形式。人们可以得到空闲，并单击提交按钮几次，这可能会导致重复...