PHP base conversion example analysis (2, 8, 16, 36, 64 base to 10 base conversion)-PHP Tutorial-php.cn

PHP base conversion example analysis (2, 8, 16, 36, 64 base to 10 base conversion)

高洛峰

Release： 2023-03-05 12:58:02

Original

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The examples in this article describe PHP hexadecimal conversion. Share it with everyone for your reference, the details are as follows:

can be realized:

Convert 10 to 2, 8, 16, 36, 62 hexadecimal

2 , 8, 16, 36, 62 decimal conversion

Something to note is that when converting 2, 8, 16 decimal, the system's own function is used.

So, no matter how high-precision conversion value is, it may be greater than 2147483646.

In addition,

32 base low precision conversion, maximum value: 2147483646;
32 base high precision conversion, maximum value: 77309411327;
64 base high precision conversion , maximum value: 133143986175.

jinzhi.php file, comes with demo function.

<?php
$mtime1 = explode(" ", microtime());
$startTime = $mtime1[0] + $mtime1[1];
?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>进制转换/title>
</head>
<body>
<form id="jzh" name="jinzhih" method="post" action="">
<input name="go" type="hidden" value="100">
<table width="482" border="1" cellpadding="0" cellspacing="0" bordercolor="#FFE8E8" bgcolor="#F4F8FB">
 <tr>
  <td width="194"><select name="jinzhi0" id="jinzhi0">
  <option value="2">2</option>
  <option value="8">8</option>
  <option value="10" selected="selected">10</option>
  <option value="16">16</option>
  <option value="36">36</option>
  <option value="62">62</option>
  </select>
进制</td>
 <td width="275"><input name="zhi" type="text" id="zhi" /></td>
 </tr>
 <tr>
  <td>进行<input name="lx" type="radio" value="0" checked="checked" />
普通<input type="radio" name="lx" value="1" />高精</td><td> </td>
 </tr>
 <tr>
  <td>转换为
  <select name="jinzhi1" id="jinzhi1">
   <option value="2" selected="selected">2</option>
   <option value="8">8</option>
   <option value="10">10</option>
   <option value="16">16</option>
   <option value="36">36</option>
   <option value="62">62</option>
  </select>进制，</td><td>总长度为
  <input name="changdu" type="text" id="changdu" value="10" size="4" maxlength="2" />
字符。</td></tr><tr>
 <td><input type="submit" name="Submit" value="提交" /></td>
 <td><input type="reset" name="Submit2" value="重置" /></td>
 </tr></table>
 <p>注意：仅能进行10进制转换为2、8、16、36、62进制；或反转换。</p></form>
<?php
class jinzhi_class
{
   //10进制转2、8、16、36、62进制
   function jinzhih_0($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[&#39;lx&#39;]=="0" && $_POST[&#39;jinzhi0&#39;]=="10")
{echo $Fs->jinzhih_0($_POST[&#39;zhi&#39;],$_POST[&#39;jinzhi1&#39;],$_POST[&#39;changdu&#39;])."
";}
if ($_POST[&#39;lx&#39;]=="1" && $_POST[&#39;jinzhi0&#39;]=="10")
{echo $Fs->jinzhih_G0($_POST[&#39;zhi&#39;],$_POST[&#39;jinzhi1&#39;],$_POST[&#39;changdu&#39;]);}
if ($_POST[&#39;lx&#39;]=="0" && $_POST[&#39;jinzhi0&#39;]>"10")
{echo $Fs->jinzhih_1($_POST[&#39;zhi&#39;],$_POST[&#39;jinzhi0&#39;],$_POST[&#39;changdu&#39;]);}
if ($_POST[&#39;lx&#39;]=="1" && $_POST[&#39;jinzhi0&#39;]>"10")
{echo $Fs->jinzhih_G1($_POST[&#39;zhi&#39;],$_POST[&#39;jinzhi0&#39;],$_POST[&#39;changdu&#39;]);}
}
echo "";}
$mtime1 = explode(" ", microtime());
$endTime = $mtime1[0] + $mtime1[1];
printf ("页面执行时间：%.6fs.",$endTime-$startTime);
?>

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I hope this article will be helpful to everyone in PHP programming.

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