How to redirect http to https in codeigniter

Question

Point #1 If I type:

www.myurl.com/somepage
http://www.myurl.com/somepage
http://myurl.com/somepage
https://myurl.com/somepage

have it redirect to

https://www.myurl.com/somepage

Point #2

When I type in something like www.myurl.com it is redirecting to https://www.myurl.com/index.php.
Make it so the index.php is not displaying. It should just display https://www.myurl.com

From Comment htaccess

RewriteEngine On 
RewriteCond %{HTTP_HOST} ^myhost\.com$ [NC] 
RewriteRule ^(.*)$ myhost.com/$1 [R=301,L] 
RewriteCond %{THE_REQUEST} ^[A-Z]+\ /index\.php(/[^\ ]*)?\ HTTP/ 
RewriteRule ^index\.php(/(.*))?$ myhost.com/$2 [R=301,L] 
RewriteCond %{REQUEST_FILENAME} !-f 
RewriteCond %{REQUEST_FILENAME} !-d 
RewriteRule ^(.*)$ index.php/$1 [L] 

Answer 1

Our SSL is from the CloudFlare CDN and so the solutions above do not work.

The following SSL detection code (in SSL.php based on @Preetham Hegde solution) works:

$isSecure = false;
if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
    $isSecure = true;
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' || !empty($_SERVER['HTTP_X_FORWARDED_SSL']) && $_SERVER['HTTP_X_FORWARDED_SSL'] == 'on') {
    $isSecure = true;
}
$REQUEST_PROTOCOL = $isSecure ? 'https' : 'http';


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

Answer 2

Now I got a solution, I updated my htaccess file.--

RewriteEngine On
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} !^www\. [OR]
RewriteCond %{HTTP_HOST} ^myhost\.com$ [NC]
RewriteRule ^ https://www.myhost.com%{REQUEST_URI} [R=301,L,NE]
RewriteCond %{THE_REQUEST} ^[A-Z]+\ /index\.php(/[^\ ]*)?\ HTTP/ 
RewriteRule ^index\.php(/(.*))?$ myhost.com/$2 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

Now, It worked for me smoothly.. :)