PHP进制转换实例分析(2,8,16,36,64进制至10进制相互转换)

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。

所以,不管怎么高精度转换值可能大于2147483646。

另外,

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><br /> </head><br /> <body></p> <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><br /> 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" /><br /> 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> <p><?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)<br /> {<br /> $zifu.= chr(($linshi+55));<br /> }else{<br /> $zifu.= $linshi;}<br /> break;<br /> case 62:<br /> if (($linshi>=10) && ($linshi36)) {$zifu.= chr($linshi+55);break;}<br /> if (($linshi>=36) && ($linshi62)) {$zifu.= chr($linshi+61);break;}<br /> $zifu.= $linshi;break;<br /> default:<br /> $zifu.= $linshi;<br /> break;<br /> }<br /> $shu = intval($shu/$jinzhi);<br /> }<br /> for ($i=strlen($zifu);$i$w;$i++)<br /> $zifu.="0";<br /> return strrev($zifu);}<br /> //2、8、16、36、62进制转10进制<br /> function jinzhih_1($zifu,$w)<br /> { $shu=0;<br /> for ($i=0;$i=strlen($zifu)-1;$i++)<br /> {<br /> $linshi = substr($zifu,$i,1);<br /> switch ($jinzhi){<br /> case 2:<br /> $shu = bindec($zifu);<br /> $i=strlen($zifu)+1;<br /> break;<br /> case 8:<br /> $shu = octdec($zifu);<br /> $i=strlen($zifu)+1;<br /> break;<br /> case 16:<br /> $shu = hexdec($zifu);<br /> $i=strlen($zifu)+1;<br /> break;<br /> case 36:<br /> if (ord($linshi)=57)<br /> {$shu+=(ord($linshi)-48)*pow($jinzhi,strlen($zifu)-$i-1);<br /> }else{<br /> $shu=$shu + (ord($linshi)-55)*pow($jinzhi,strlen($zifu)-$i-1);}<br /> break;<br /> case 62:<br /> if (ord($linshi)=57)<br /> {$shu+=$linshi*pow($jinzhi,strlen($zifu)-$i-1);<br /> }elseif ((ord($linshi)>=65) && (ord($linshi)=90)){<br /> $shu+= (ord($linshi)-55)*pow($jinzhi,strlen($zifu)-$i-1);<br /> }else{<br /> $shu+= (ord($linshi)-61)*pow($jinzhi,strlen($zifu)-$i-1);}<br /> break;<br /> }<br /> }<br /> return $shu;<br /> }<br /> //10进制高精度转换2、8、16、36、62进制<br /> function jinzhih_G0($shu,$w)<br /> {<br /> $zifu = "";<br /> while ($shu!=0){<br /> $linshi = bcmod($shu,$jinzhi);<br /> switch ($jinzhi){<br /> case 2:<br /> $zifu = decbin($shu);<br /> return $zifu;<br /> case 8:<br /> $zifu = decoct($shu);<br /> return $zifu;<br /> case 16:<br /> $zifu = dechex($shu);<br /> return $zifu;<br /> case 36:<br /> if ($linshi>=10)<br /> {<br /> $zifu.= chr(($linshi+55));<br /> }else{<br /> $zifu.= $linshi;}<br /> break;<br /> case 62:<br /> if (($linshi>=10) && ($linshi36)) {$zifu.= chr($linshi+55);break;}<br /> if (($linshi>=36) && ($linshi62)) {$zifu.= chr($linshi+61);break;}<br /> $zifu.= $linshi;break;<br /> default:<br /> $zifu.= $linshi;<br /> break;<br /> }<br /> $shu = intval(bcdiv($shu,$jinzhi));<br /> }<br /> for ($i=strlen($zifu);$i$w;$i++)<br /> $zifu.="0";<br /> return strrev($zifu);}<br /> //2、8、16、36、62进制高精度转换10进制<br /> function jinzhih_G1($zifu,$w)<br /> { $shu= "";<br /> for ($i=0;$i=strlen($zifu)-1;$i++)<br /> {<br /> $linshi = substr($zifu,1);<br /> switch ($jinzhi){<br /> case 2:<br /> $shu = bindec($zifu);<br /> $i=strlen($zifu)+1;<br /> break;<br /> case 8:<br /> $shu = octdec($zifu);<br /> $i=strlen($zifu)+1;<br /> break;<br /> case 16:<br /> $shu = hexdec($zifu);<br /> $i=strlen($zifu)+1;<br /> break;<br /> case 36:<br /> if (ord($linshi)=57)<br /> {$shu=bcadd($shu,bcmul((ord($linshi)-48),bcpow($jinzhi,strlen($zifu)-$i-1)));<br /> }else{<br /> $shu=bcadd($shu,bcmul((ord($linshi)-55),strlen($zifu)-$i-1)));}<br /> break;<br /> case 62:<br /> if (ord($linshi)=57)<br /> {$shu=bcadd($shu,bcmul($linshi,strlen($zifu)-$i-1)));<br /> }elseif ((ord($linshi)>=65) && (ord($linshi)=90)){<br /> $shu=bcadd($shu,strlen($zifu)-$i-1)));<br /> }else{<br /> $shu=bcadd($shu,bcmul((ord($linshi)-61),strlen($zifu)-$i-1)));<br /> }<br /> break;<br /> }<br /> }<br /> return $shu;}<br /> }<br /> if (isset($_GET["p"]))<br /> {if ($_GET["p"]==="1"){<br /> echo "";<br /> echo "提示:<br /> ";<br /> echo "32进制低精转换,最大值:2147483646<br /> ";<br /> echo "32进制高精转换,最大值:77309411327<br /> ";<br /> echo "64进制高精转换,最大值:133143986175<br /> ";<br /> echo "";<br /> echo "值为:";<br /> $Fs = new jinzhi_class();<br /> if ($_POST['lx']=="0" && $_POST['jinzhi0']=="10")<br /> {echo $Fs->jinzhih_0($_POST['zhi'],$_POST['jinzhi1'],$_POST['changdu'])."<br /> ";}<br /> if ($_POST['lx']=="1" && $_POST['jinzhi0']=="10")<br /> {echo $Fs->jinzhih_G0($_POST['zhi'],$_POST['changdu']);}<br /> if ($_POST['lx']=="0" && $_POST['jinzhi0']>"10")<br /> {echo $Fs->jinzhih_1($_POST['zhi'],$_POST['jinzhi0'],$_POST['changdu']);}<br /> if ($_POST['lx']=="1" && $_POST['jinzhi0']>"10")<br /> {echo $Fs->jinzhih_G1($_POST['zhi'],$_POST['changdu']);}<br /> }<br /> echo "";}<br /> $mtime1 = explode(" ",microtime());<br /> $endTime = $mtime1[0] + $mtime1[1];<br /> printf ("页面执行时间:%.6fs.",$endTime-$startTime);<br /> ?></pre> 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