如果文件大小为字节单位的,阅读起来不方便,这个函数可以把字节单位转换成KB,MB,GB,TB等单位,方便阅读
function ByteSize ( $file_size ) { $file_size = $file_size-1; if ($file_size >= 1099511627776) $show_filesize = number_format(($file_size / 1099511627776),2) . " TB"; elseif ($file_size >= 1073741824) $show_filesize = number_format(($file_size / 1073741824),2) . " GB"; elseif ($file_size >= 1048576) $show_filesize = number_format(($file_size / 1048576),2) . " MB"; elseif ($file_size >= 1024) $show_filesize = number_format(($file_size / 1024),2) . " KB"; elseif ($file_size > 0) $show_filesize = $file_size . " b"; elseif ($file_size == 0 || $file_size == -1) $show_filesize = "0 b"; return $show_filesize; }