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【PHP】处理文件大小的函数
作者: / 发布于2011/1/4/ 491
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            <pre style="line-height: 150%; font-family: Verdana, Monospace; font-size: 12px; font-weight: bold; margin-right: 10px"><span style="font-style: italic; color: #666666">//把整数形式的文件大小变成易读的字符串形式</span>
<span style="color: #0000ff">function</span> filesize_str<span style="color: #009900">(</span><span style="color: #000088">$size</span><span style="color: #009900">)</span><span style="color: #009900">{</span>
  <span style="color: #000088">$sizes</span> <span style="color: #339933">=</span> <span style="color: blue">array</span><span style="color: #009900">(</span><span style="color: #0000ff">' B'</span><span style="color: #339933">,</span> <span style="color: #0000ff">' KB'</span><span style="color: #339933">,</span> <span style="color: #0000ff">' MB'</span><span style="color: #339933">,</span> <span style="color: #0000ff">' GB'</span><span style="color: #339933">,</span> <span style="color: #0000ff">' TB'</span><span style="color: #339933">,</span> <span style="color: #0000ff">' PB'</span><span style="color: #009900">)</span><span style="color: #339933">;</span>
  <span style="color: #0099cc">if</span> <span style="color: #009900">(</span><span style="color: #000088">$size</span> <span style="color: #339933">==</span> <span style="color: #cc66cc">0</span><span style="color: #009900">)</span> <span style="color: #009900">{</span> <span style="color: #0099cc">return</span><span style="color: #009900">(</span><span style="color: #0000ff">'n/a'</span><span style="color: #009900">)</span><span style="color: #339933">;</span> <span style="color: #009900">}</span> <span style="color: #0099cc">else</span> <span style="color: #009900">{</span>
  <span style="color: #0099cc">return</span> <span style="color: #009900">(</span><span style="color: blue">round</span><span style="color: #009900">(</span><span style="color: #000088">$size</span><span style="color: #339933">/</span><span style="color: blue">pow</span><span style="color: #009900">(</span><span style="color: #cc66cc">1024</span><span style="color: #339933">,</span> <span style="color: #009900">(</span><span style="color: #000088">$i</span> <span style="color: #339933">=</span> <span style="color: blue">floor</span><span style="color: #009900">(</span><span style="color: blue">log</span><span style="color: #009900">(</span><span style="color: #000088">$size</span><span style="color: #339933">,</span> <span style="color: #cc66cc">1024</span><span style="color: #009900">)</span><span style="color: #009900">)</span><span style="color: #009900">)</span><span style="color: #009900">)</span><span style="color: #339933">,</span> <span style="color: #cc66cc">2</span><span style="color: #009900">)</span> <span style="color: #339933">.</span> <span style="color: #000088">$sizes</span><span style="color: #009900">[</span><span style="color: #000088">$i</span><span style="color: #009900">]</span><span style="color: #009900">)</span><span style="color: #339933">;</span> <span style="color: #009900">}</span>
<span style="color: #009900">}</span>

<span style="font-style: italic; color: #666666">//把易读的字符串形式的文件大小变回整数</span>
<span style="color: #0000ff">function</span> filesize_int<span style="color: #009900">(</span><span style="color: #000088">$str</span><span style="color: #009900">)</span><span style="color: #009900">{</span>
  <span style="color: #000088">$bytes</span> <span style="color: #339933">=</span> <span style="color: #cc66cc">0</span><span style="color: #339933">;</span>

  <span style="color: #000088">$bytes_array</span> <span style="color: #339933">=</span> <span style="color: blue">array</span><span style="color: #009900">(</span>
    <span style="color: #0000ff">'B'</span> <span style="color: #339933">=></span> <span style="color: #cc66cc">1</span><span style="color: #339933">,</span>
    <span style="color: #0000ff">'KB'</span> <span style="color: #339933">=></span> <span style="color: #cc66cc">1024</span><span style="color: #339933">,</span>
    <span style="color: #0000ff">'MB'</span> <span style="color: #339933">=></span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span><span style="color: #339933">,</span>
    <span style="color: #0000ff">'GB'</span> <span style="color: #339933">=></span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span><span style="color: #339933">,</span>
    <span style="color: #0000ff">'TB'</span> <span style="color: #339933">=></span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span><span style="color: #339933">,</span>
    <span style="color: #0000ff">'PB'</span> <span style="color: #339933">=></span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span> <span style="color: #339933">*</span> <span style="color: #cc66cc">1024</span><span style="color: #339933">,</span>
  <span style="color: #009900">)</span><span style="color: #339933">;</span>

  <span style="color: #000088">$bytes</span> <span style="color: #339933">=</span> <span style="color: blue">floatval</span><span style="color: #009900">(</span><span style="color: #000088">$str</span><span style="color: #009900">)</span><span style="color: #339933">;</span>

  <span style="color: #0099cc">if</span> <span style="color: #009900">(</span><span style="color: blue">preg_match</span><span style="color: #009900">(</span><span style="color: #0000ff">'/([KMGTP]?B)$/si'</span><span style="color: #339933">,</span> <span style="color: blue">strtoupper</span><span style="color: #009900">(</span><span style="color: #000088">$str</span><span style="color: #009900">)</span><span style="color: #339933">,</span> <span style="color: #000088">$matches</span><span style="color: #009900">)</span> <span style="color: #339933">&&</span> 
      <span style="color: #339933">!</span><span style="color: blue">empty</span><span style="color: #009900">(</span><span style="color: #000088">$bytes_array</span><span style="color: #009900">[</span><span style="color: #000088">$matches</span><span style="color: #009900">[</span><span style="color: #cc66cc">1</span><span style="color: #009900">]</span><span style="color: #009900">]</span><span style="color: #009900">)</span><span style="color: #009900">)</span> <span style="color: #009900">{</span>
    
    <span style="color: #000088">$bytes</span> <span style="color: #339933">*=</span> <span style="color: #000088">$bytes_array</span><span style="color: #009900">[</span><span style="color: #000088">$matches</span><span style="color: #009900">[</span><span style="color: #cc66cc">1</span><span style="color: #009900">]</span><span style="color: #009900">]</span><span style="color: #339933">;</span>
  <span style="color: #009900">}</span>

  <span style="color: #000088">$bytes</span> <span style="color: #339933">=</span> <span style="color: blue">intval</span><span style="color: #009900">(</span><span style="color: blue">round</span><span style="color: #009900">(</span><span style="color: #000088">$bytes</span><span style="color: #339933">,</span> <span style="color: #cc66cc">2</span><span style="color: #009900">)</span><span style="color: #009900">)</span><span style="color: #339933">;</span>

  <span style="color: #0099cc">return</span> <span style="color: #000088">$bytes</span><span style="color: #339933">;</span> 
<span style="color: #009900">}</span></pre>
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