Function helper to get max file upload size in Bytes

SystemUtil.php

<?php 

namespace App\Infrastructure\Utilities;

class SystemUtil
{
	public static function maxFileUploadSize()
	{
		//select maximum upload size
	    $maxUpload = self::getBytes(ini_get('upload_max_filesize'));
	    //select post limit
	    $maxPost = self::getBytes(ini_get('post_max_size'));
	    //select memory limit
	    $memoryLimit = self::getBytes(ini_get('memory_limit'));
	    // return the smallest of them, this defines the real limit
	    return min($maxUpload, $maxPost, $memoryLimit);
	}

	public static function getBytes($val)
	{
		$val = trim($val);
	    $last = strtolower($val[strlen($val)-1]);
	    switch($last) 
	    {
	        case 'g':
	        $val *= 1024;
	        case 'm':
	        $val *= 1024;
	        case 'k':
	        $val *= 1024;
	    }
	    return $val;
	}
}