redirect all to https code example

Example 1: http to https htaccess

RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.yourdomain.com/$1 [R,L]

Example 2: redirect https

if ($_SERVER['HTTPS'] != "on") 
{
    $url = "https://". $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'];
    header("Location: $url");
    exit;
}