baseurl

<?php
function _basehost() {
    if ( !empty($_SERVER["HTTP_HOST"]) ) {
        $schema = ( !empty($_SERVER["HTTPS"]) && strtolower($_SERVER["HTTPS"]) == "on") ? "https://": "http://";
        $host = $_SERVER["HTTP_HOST"];
        return $schema.$host;
    }
    return null;
}

function _baseurl() {
    if ( !empty($_SERVER['SCRIPT_NAME']) ) {
        $base = substr($_SERVER['SCRIPT_NAME'], 0, strrpos($_SERVER['SCRIPT_NAME'], "/")+1);
        if ( $base != '/') $base = rtrim($base,'/');
        $host = _basehost();
        $base = ( !empty($host) ? ( ( $base != '/' ) ? $host.$base : $host."/".$base ) : ( ( $base != '/' ) ? $base : "" ) );
        return rtrim($base,'/');
    }
    return null;
}