How to ridirect http to https with uot .htaccess

there is some way to redirect from http to https withuot .htaccess

 

.htaccess is surely the best way to do this, but you can also redirect traffic to https using PHP

if(empty($_SERVER['HTTPS']) || $_SERVER['HTTPS'] == "off"){
    $redirect = 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
    header('HTTP/1.1 301 Moved Permanently');
    header('Location: ' . $redirect);
    exit();
}

Code (markup):

 

where I add this? Please

 

At the top of PHP file(s). Before any other code.

 

I can add in index.php or in header.php?

 

At the top of your PHP file(s). It impossible to tell which file exactly you need to add this code to, because only you know the structure of your files.

 

I'm using Wordpress

 

Then simply look at WordPress files to check which files are served first, and include code there.