Redirect From HTTP to HTTPS

Hey, I recently installed Lets Encrypt SSL, its successful however it wont redirect whenever its on http. So how to redirect all to https??

Here method I already tried but it seems wont working: 1 .htaccess

RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

2. Redirect PHP Function

< ?php function redirectTohttps() { if($_SERVER[‘HTTPS’]!=”on”) { $redirect= “https://”.$_SERVER[‘HTTP_HOST’].$_SERVER[‘REQUEST_URI’]; header(“Location:$redirect”); } } ?>

3. HTML Meta Tag

< meta http-equiv=“Refresh” content=“0;URL=https://www.example.com” />

Note*: This method works however it cause infinite loop and crash the server.