File size calculator

File size calculator function return file size format into kb, mb or gb.

function file_size($size, $out = 'kb', $precision = 2)
    switch ($out) {
        case 'kb':
            return round($size / 1024, $precision);
        case 'mb':
            return round($size / (1024 * 1024), $precision);
        case 'gb':
            return round($size / (1024 * 1024 * 1024), $precision);
    return false;


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