<?php

function get_http_type(){
    $http_type = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https://' : 'http://';
    return $http_type;
}

function size_unit($num){
    $p = 0;
    $format='Byte';
    if($num>0 && $num<1024){
        $p = 0;
        return number_format($num).' '.$format;
    }
    if($num>=1024 && $num<pow(1024, 2)){
        $p = 1;
        $format = 'KB';
    }
    if ($num>=pow(1024, 2) && $num<pow(1024, 3)) {
        $p = 2;
        $format = 'MB';
    }
    if ($num>=pow(1024, 3) && $num<pow(1024, 4)) {
        $p = 3;
        $format = 'GB';
    }
    if ($num>=pow(1024, 4) && $num<pow(1024, 5)) {
        $p = 3;
        $format = 'TB';
    }
    $num /= pow(1024, $p);
    return number_format($num, 3).' '.$format;
}