Detailed explanation of PHP hexadecimal conversion examples-PHP Tutorial-php.cn

This article mainly introduces PHP base conversion, and analyzes the implementation techniques of 2, 8, 16, 36, 64 base to 10 base conversion based on specific examples. It has certain reference value. Friends who need it can Refer to the example below

This article describes PHP base 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 hexadecimal conversion to decimal

Please note that when converting 2, 8, 16 hexadecimal, 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.

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<?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;
   }
   $shu = intval(bcp($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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