php自定义函数: 文件大小转换成智能形式

function format_byte($filesize) { ???if($filesize >= 1073741824) { ???????$filesize = round($filesize / 1073741824 * 100) / 100 . ‘ gb‘; ???} elseif($filesize >= 1048576) { ???????$filesize = round($filesize / 1048576 * 100) / 100 . ‘ mb‘; ???} elseif($filesize >= 1024) { ???????$filesize = round($filesize / 1024 * 100) / 100 . ‘ kb‘; ???} else { ???????$filesize = $filesize . ‘ bytes‘; ???} ???return $filesize;}