PHP中文件字节大小单位的转换函数

文件大小的单位转换，自动将字节转换为KB、MB、GB等

function RealSize($size){if ($size < 1024){return $size.' Byte';}if ($size < 1048576){return round($size / 1024, 2).' KB';}if ($size < 1073741824){return round($size / 1048576, 2).' MB';}if ($size < 1099511627776){return round($size / 1073741824, 2).' GB';}}