没有错误，但代码不起作用

I created a contact form and I can't seem to find the error in the code now my problem is this when I click the Submit button it returns a blank page without displaying any error.

This is the result I get

Link to the script contact.html(php actually)

Error reporting is probably not set to display errors, it doesn't mean that there is none.

Add the followings line to your php page :

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

You'll then see errors.

If you don't want errors to display and it's an ajax request to your php script, you can console.log the server response into your javascript request handler :)