字节换算

字节换算

//字节换算
function conversion($size) {
$kb = 1024; // 1KB（Kibibyte，千字节）=1024B，
$mb = 1024 * $kb; //1MB（Mebibyte，兆字节，简称“兆”）=1024KB，
$gb = 1024 * $mb; // 1GB（Gigabyte，吉字节，又称“千兆”）=1024MB，
$tb = 1024 * $gb; // 1TB（Terabyte，万亿字节，太字节）=1024GB，
$pb = 1024 * $tb; //1PB（Petabyte，千万亿字节，拍字节）=1024TB，
$fb = 1024 * $pb; //1EB（Exabyte，百亿亿字节，艾字节）=1024PB，
$zb = 1024 * $fb; //1ZB（Zettabyte，十万亿亿字节，泽字节）= 1024EB，
$yb = 1024 * $zb; //1YB（Yottabyte，一亿亿亿字节，尧字节）= 1024ZB，
$bb = 1024 * $yb; //1BB（Brontobyte，一千亿亿亿字节）= 1024YB

if ($size < $kb) {
return $size . " B";
} else if ($size < $mb) {
return round($size / $kb, 2) . " KB";
} else if ($size < $gb) {
return round($size / $mb, 2) . " MB";
} else if ($size < $tb) {
return round($size / $gb, 2) . " GB";
} else if ($size < $pb) {
return round($size / $tb, 2) . " TB";
} else if ($size < $fb) {
return round($size / $pb, 2) . " PB";
} else if ($size < $zb) {
return round($size / $fb, 2) . " EB";
} else if ($size < $yb) {
return round($size / $zb, 2) . " ZB";
} else {
return round($size / $bb, 2) . " YB";
}

}