PHP format (file) store data size (sizes) display, _php tutorial

PHP format (file) stores the data size (sizes) display,

Sometimes we need to show the size of a file on a Web page, or the size or number of other data.

This number is often from a large span, if the unit B is a bit, if 1G is up to 1073741824 of the number, this time we need to format according to the size, such as less than 1K is displayed in units B, less than 1M is displayed in kilobytes, less than 1G is displayed in megabytes, etc...

The Format function reference is as follows:

//Format size DisplayfunctionFormatsize ($b,$times=0){    if($b>1024){        $temp=$b/1024; returnFormatsize ($temp,$times+1); }Else{        $unit= ' B '; Switch($times){             Case' 0 ':$unit= ' B '; Break;  Case' 1 ':$unit= ' KB '; Break;  Case' 2 ':$unit= ' MB '; Break;  Case' 3 ':$unit= ' GB '; Break;  Case' 4 ':$unit= ' TB '; Break;  Case' 5 ':$unit= ' PB '; Break;  Case' 6 ':$unit= ' EB '; Break;  Case' 7 ':$unit= ' ZB '; Break; default:$unit= ' Unit unknown '; }        return sprintf('%.2f ',$b).$unit; }}

Call:

echo formatsize (' 20667564 ');

The result is:

19.71MB

Description

Where the parameter $b is a number in B, $times is used to identify how many times the function is recursive.

The non-commonly used units TB, PB, EB, ZB please refer to the following notes (from the network):

1bit (this bit represents a binary number)
1Byte (this word is also called "bit") but it represents a hexadecimal number.
1b=1byte=8bit
1 KB = 1024x768 B (kb-kilobyte) thousand
1 MB = KB (mb-megabyte) trillion
1 GB = 1024x768 (gb-gigabyte)
1 TB = 1024x768 (tb-terabyte) too
1 PB = 1024x768 TB (pb-petabyte) Pat
1 EB = 1024x768 PB (eb-eksabyte) AI
1 ZB = Zb-zettabyte (EB)
1 YB = 1024x768 ZB (yb-yottabyte) Woo
1 BB = YB (bb-brontobyte)
Yotta, Yao [it], Y. 10^21,
Zetta, ze [it], Z. 10^18,
Exa, Ai [sa], E. 10^15,
PETA, Pat [it], P. 10^12,
Tera, too [pull], T. 10^9,
Giga, Ji [Cafe], G. 10^6,
Mega, trillion, M. 10^3

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