Function _filesize

Find the size of the given file.

Package: PHPLucidFrame\Core
Copyright: Copyright (c), PHPLucidFrame.
License: MIT License This source file is subject to the MIT license that is bundled with this source code in the file LICENSE
Author: Sithu sithu@phplucidframe.com
Located at helpers/utility_helper.php

Parameters summary
`string`	`$file`	The file name (file must exist)
`integer`	`$digits = 2`	Number of precisions
`array`	`$sizes = array("MB","KB","B")`	Array of size units, e.g., array("TB","GB","MB","KB","B"). Default is array("MB","KB","B")

Return value summary
`string\|boolean`	The size unit (B, KiB, MiB, GiB, TiB, PiB, EiB, ZiB, YiB) or `FALSE` for non-existence file