Get domain url from link

gistfile1.php

// function extract a domain url from the link
// !Note: the domain name case is transformed to lowercase
function get_domain( $url ){

            $url = strtolower( $url );
    
            $base = str_ireplace( 'http://', '', $url );
            $base = str_ireplace( 'https://', '', $base );            
            
            if( preg_match( '/^www\./i', $base ) ){
            
                $base = str_ireplace( 'www.', '', $base );

                $www = true;

            }

            $base_data = explode( "/", $base );
            $domain = $base_data[0];

            if( !empty( $www ) ){

                $domain = 'www.'.$domain;

            }

            if( preg_match('/^http:\/\//i', $url ) ){

                $base_url = 'http://'.$domain.'/';

            }

            if( preg_match('/^https:\/\//i', $url ) ){

                $base_url = 'https://'.$domain.'/';

            }            

            return $base_url;

}