Force loading with the WWW ( htaccess, php, nginx and web.config )

.htaccess

RewriteEngine On
RewriteCond %{HTTP_HOST} !^$
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteCond %{HTTPS}s ^on(s)|
RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

index.php

<?php
function get_current_url(){
    $url = 'http';
    if ( isset( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] == 'on'){
        $url .= s;
    }
    $url .= '://www.';
    if ( isset( $_SERVER['SERVER_PORT'] ) && $_SERVER['SERVER_PORT'] != 80 ) {
        $url .= $_SERVER['SERVER_NAME'] . $_SERVER['SERVER_PORT'] . $_SERVER['REQUEST_URI'];
    }else{
        $url .= $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'];
    }

    /*
     * Is not required
     */
    //$url = str_replace( "'", '', $url );
    //$url = str_replace( '"', '', $url );

    return $url;
}
if ( strpos( $_SERVER['SERVER_NAME'], 'www.') === false ){
    @header( "Location: ". get_current_url(), true, 301 );
    exit();
}

echo "Hello Word";

nginx

location / {
    if ($http_host !~ "^$"){
        rewrite ^(.*)$ http%1://www.$http_host$request_uri redirect;
    }
}

web.config

<rule name="rule 1f" stopProcessing="true">
    <match url="^"  />
    <action type="Rewrite" url="/http%1://www.%{HTTP_HOST}%{REQUEST_URI}"  />
</rule>