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PHP进制转换实例分析(2,8,16,36,64进制至10进制相互转换)

高洛峰

高洛峰

发布时间:2017-02-06 15:58:29

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1854人浏览过

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来源于php中文网

原创

本文实例讲述了php进制转换。分享给大家供大家参考,具体如下:

可以实现:

10进制转换2、8、16、36、62进制

2、8、16、36、62进制转换10进制

有点要注意下,2、8、16进制转换时,使用的是系统的自己的函数。

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所以,不管怎么高精度转换值可能大于2147483646。

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32进制低精转换,最大值:2147483646;
32进制高精转换,最大值:77309411327;
64进制高精转换,最大值:133143986175。

jinzhi.php文件,自带演示功能。





进制转换/title>
</head>
<body>
<form id="jzh" name="jinzhih" method="post" action="">
<input name="go" type="hidden" value="100">
<table width="482" border="1" cellpadding="0" cellspacing="0" bordercolor="#FFE8E8" bgcolor="#F4F8FB">
 <tr>
  <td width="194"><select name="jinzhi0" id="jinzhi0">
  <option value="2">2</option>
  <option value="8">8</option>
  <option value="10" selected="selected">10</option>
  <option value="16">16</option>
  <option value="36">36</option>
  <option value="62">62</option>
  </select>
进制</td>
 <td width="275"><input name="zhi" type="text" id="zhi" /></td>
 </tr>
 <tr>
  <td>进行<input name="lx" type="radio" value="0" checked="checked" />
普通<input type="radio" name="lx" value="1" />高精</td><td> </td>
 </tr>
 <tr>
  <td>转换为
  <select name="jinzhi1" id="jinzhi1">
   <option value="2" selected="selected">2</option>
   <option value="8">8</option>
   <option value="10">10</option>
   <option value="16">16</option>
   <option value="36">36</option>
   <option value="62">62</option>
  </select>进制,</td><td>总长度为
  <input name="changdu" type="text" id="changdu" value="10" size="4" maxlength="2" />
字符。</td></tr><tr>
 <td><input type="submit" name="Submit" value="提交" /></td>
 <td><input type="reset" name="Submit2" value="重置" /></td>
 </tr></table>
 <p>注意:仅能进行10进制转换为2、8、16、36、62进制;或反转换。</p></form>
<?php
class jinzhi_class
{
   //10进制转2、8、16、36、62进制
   function jinzhih_0($shu,$jinzhi,$w)
   {
   $zifu = "";
   while ($shu!=0){
   $linshi = $shu%$jinzhi;
   switch ($jinzhi){
    case 2:
     $zifu = decbin($shu);
     return $zifu;
    case 8:
     $zifu = decoct($shu);
     return $zifu;
    case 16:
     $zifu = dechex($shu);
     return $zifu;
    case 36:
     if ($linshi>=10)
     {
     $zifu.= chr(($linshi+55));
     }else{
      $zifu.= $linshi;}
     break;
    case 62:
     if (($linshi>=10) && ($linshi36)) {$zifu.= chr($linshi+55);break;}
     if (($linshi>=36) && ($linshi62)) {$zifu.= chr($linshi+61);break;}
     $zifu.= $linshi;break;
   default:
   $zifu.= $linshi;
   break;
   }
   $shu = intval($shu/$jinzhi);
   }
   for ($i=strlen($zifu);$i$w;$i++)
   $zifu.="0";
  return strrev($zifu);}
   //2、8、16、36、62进制转10进制
   function jinzhih_1($zifu,$jinzhi,$w)
 { $shu=0;
  for ($i=0;$i=strlen($zifu)-1;$i++)
     {
     $linshi = substr($zifu,$i,1);
     switch ($jinzhi){
      case 2:
       $shu = bindec($zifu);
       $i=strlen($zifu)+1;
       break;
      case 8:
       $shu = octdec($zifu);
      $i=strlen($zifu)+1;
      break;
      case 16:
       $shu = hexdec($zifu);
       $i=strlen($zifu)+1;
       break;
     case 36:
      if (ord($linshi)=57)
      {$shu+=(ord($linshi)-48)*pow($jinzhi,strlen($zifu)-$i-1);
     }else{
       $shu=$shu + (ord($linshi)-55)*pow($jinzhi,strlen($zifu)-$i-1);}
       break;
     case 62:
      if (ord($linshi)=57)
      {$shu+=$linshi*pow($jinzhi,strlen($zifu)-$i-1);     
     }elseif ((ord($linshi)>=65) && (ord($linshi)=90)){
      $shu+= (ord($linshi)-55)*pow($jinzhi,strlen($zifu)-$i-1);
      }else{
      $shu+= (ord($linshi)-61)*pow($jinzhi,strlen($zifu)-$i-1);}
      break;
     }
   }
   return $shu;
   }
   //10进制高精度转换2、8、16、36、62进制
   function jinzhih_G0($shu,$jinzhi,$w)
   {
   $zifu = "";
   while ($shu!=0){
   $linshi = bcmod($shu,$jinzhi);
   switch ($jinzhi){
    case 2:
     $zifu = decbin($shu);
     return $zifu;
    case 8:
     $zifu = decoct($shu);
     return $zifu;
    case 16:
     $zifu = dechex($shu);
     return $zifu;
    case 36:
     if ($linshi>=10)
     {
     $zifu.= chr(($linshi+55));
     }else{
      $zifu.= $linshi;}
     break;
    case 62:
     if (($linshi>=10) && ($linshi36)) {$zifu.= chr($linshi+55);break;}
     if (($linshi>=36) && ($linshi62)) {$zifu.= chr($linshi+61);break;}
     $zifu.= $linshi;break;
   default:
   $zifu.= $linshi;
   break;
   }
   $shu = intval(bcdiv($shu,$jinzhi));
   }
   for ($i=strlen($zifu);$i$w;$i++)
   $zifu.="0";
  return strrev($zifu);}
   //2、8、16、36、62进制高精度转换10进制
   function jinzhih_G1($zifu,$jinzhi,$w)
 { $shu= "";
  for ($i=0;$i=strlen($zifu)-1;$i++)
     {
     $linshi = substr($zifu,$i,1);
     switch ($jinzhi){
      case 2:
       $shu = bindec($zifu);
       $i=strlen($zifu)+1;
       break;
      case 8:
       $shu = octdec($zifu);
      $i=strlen($zifu)+1;
      break;
      case 16:
       $shu = hexdec($zifu);
       $i=strlen($zifu)+1;
       break;
     case 36:
      if (ord($linshi)=57)
      {$shu=bcadd($shu,bcmul((ord($linshi)-48),bcpow($jinzhi,strlen($zifu)-$i-1)));
     }else{
       $shu=bcadd($shu,bcmul((ord($linshi)-55),bcpow($jinzhi,strlen($zifu)-$i-1)));}
       break;
     case 62:
      if (ord($linshi)=57)
      {$shu=bcadd($shu,bcmul($linshi,bcpow($jinzhi,strlen($zifu)-$i-1)));
     }elseif ((ord($linshi)>=65) && (ord($linshi)=90)){
      $shu=bcadd($shu,bcmul((ord($linshi)-55),bcpow($jinzhi,strlen($zifu)-$i-1)));
      }else{
      $shu=bcadd($shu,bcmul((ord($linshi)-61),bcpow($jinzhi,strlen($zifu)-$i-1)));
      }
      break;
     }
   }
   return $shu;}
}
if (isset($_GET["p"]))
{if ($_GET["p"]==="1"){
echo "";
echo "提示:
";
echo "32进制低精转换,最大值:2147483646
";
echo "32进制高精转换,最大值:77309411327
";
echo "64进制高精转换,最大值:133143986175
";
echo "";
echo "值为:";
$Fs = new jinzhi_class();
if ($_POST['lx']=="0" && $_POST['jinzhi0']=="10")
{echo $Fs->jinzhih_0($_POST['zhi'],$_POST['jinzhi1'],$_POST['changdu'])."
";}
if ($_POST['lx']=="1" && $_POST['jinzhi0']=="10")
{echo $Fs->jinzhih_G0($_POST['zhi'],$_POST['jinzhi1'],$_POST['changdu']);}
if ($_POST['lx']=="0" && $_POST['jinzhi0']>"10")
{echo $Fs->jinzhih_1($_POST['zhi'],$_POST['jinzhi0'],$_POST['changdu']);}
if ($_POST['lx']=="1" && $_POST['jinzhi0']>"10")
{echo $Fs->jinzhih_G1($_POST['zhi'],$_POST['jinzhi0'],$_POST['changdu']);}
}
echo "";}
$mtime1 = explode(" ", microtime());
$endTime = $mtime1[0] + $mtime1[1];
printf ("页面执行时间:%.6fs.",$endTime-$startTime);
?></pre><p>希望本文所述对大家PHP程序设计有所帮助。</p>
<p>更多PHP进制转换实例分析(2,8,16,36,64进制至10进制相互转换)相关文章请关注PHP中文网!</p>					</div>
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