PHP格式化(文件)储存数据大小(SIZE)显示

<span style="color: #008000">//</span><span style="color: #008000">格式化size显示</span><span style="color: #0000ff">function</span> formatSize(<span style="color: #800080">$b</span>,<span style="color: #800080">$times</span>=0<span style="color: #000000">){</span>    <span style="color: #0000ff">if</span>(<span style="color: #800080">$b</span>>1024<span style="color: #000000">){        </span><span style="color: #800080">$temp</span>=<span style="color: #800080">$b</span>/1024<span style="color: #000000">;        </span><span style="color: #0000ff">return</span> formatSize(<span style="color: #800080">$temp</span>,<span style="color: #800080">$times</span>+1<span style="color: #000000">);    }</span><span style="color: #0000ff">else</span><span style="color: #000000">{        </span><span style="color: #800080">$unit</span>='B'<span style="color: #000000">;        </span><span style="color: #0000ff">switch</span>(<span style="color: #800080">$times</span><span style="color: #000000">){            </span><span style="color: #0000ff">case</span> '0':<span style="color: #800080">$unit</span>='B';<span style="color: #0000ff">break</span><span style="color: #000000">;            </span><span style="color: #0000ff">case</span> '1':<span style="color: #800080">$unit</span>='KB';<span style="color: #0000ff">break</span><span style="color: #000000">;            </span><span style="color: #0000ff">case</span> '2':<span style="color: #800080">$unit</span>='MB';<span style="color: #0000ff">break</span><span style="color: #000000">;            </span><span style="color: #0000ff">case</span> '3':<span style="color: #800080">$unit</span>='GB';<span style="color: #0000ff">break</span><span style="color: #000000">;            </span><span style="color: #0000ff">case</span> '<div style="color:transparent">！本文来源gaodai.ma#com搞#代!码(网</div><em>搞gaodaima代码</em>4':<span style="color: #800080">$unit</span>='TB';<span style="color: #0000ff">break</span><span style="color: #000000">;            </span><span style="color: #0000ff">case</span> '5':<span style="color: #800080">$unit</span>='PB';<span style="color: #0000ff">break</span><span style="color: #000000">;            </span><span style="color: #0000ff">case</span> '6':<span style="color: #800080">$unit</span>='EB';<span style="color: #0000ff">break</span><span style="color: #000000">;            </span><span style="color: #0000ff">case</span> '7':<span style="color: #800080">$unit</span>='ZB';<span style="color: #0000ff">break</span><span style="color: #000000">;            </span><span style="color: #0000ff">default</span>: <span style="color: #800080">$unit</span>='单位未知'<span style="color: #000000">;        }        </span><span style="color: #0000ff">return</span> <span style="color: #008080">sprintf</span>('%.2f',<span style="color: #800080">$b</span>).<span style="color: #800080">$unit</span><span style="color: #000000">;    }}</span>

调用：

<span style="color: #0000ff">echo</span> formatSize('20667564');

结果是：

19.71MB

说明：

其中参数$b是以B为单位的数字，$times是用来标识这个函数递归了多少次的。

其中不常用的单位TB、PB、EB、ZB请参考下面的备注(来源于网络)：

1bit（这个比特表示一个二进制数字）
1Byte（这个单词音译过来也叫“比特”但是表示一个十六进制的数字）
1B=1Byte=8bit
1 kB = 1024 B (kB – kilobyte) 千
1 MB = 1024 kB (MB – megabyte) 兆
1 GB = 1024 MB (GB – gigabyte) 吉
1 TB = 1024 GB (TB – terabyte) 太
1 PB = 1024 TB (PB – petabyte) 拍
1 EB = 1024 PB (EB – eksabyte) 艾
1 ZB = 1024 EB (ZB – zettabyte) 皆
1 YB = 1024 ZB (YB – yottabyte) 佑
1 BB = 1024 YB (BB – brontobyte)
yotta, 尧[它], Y. 10^21,
zetta, 泽[它], Z. 10^18,
exa, 艾[可萨], E. 10^15,
peta, 拍[它], P. 10^12,
tera, 太[拉], T. 10^9,
giga, 吉[咖], G. 10^6,
mega, 兆，M. 10^3

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