PHP整数N进制转换，短网址ID转换
- WBOYasal
- 2016-06-07 11:45:091385semak imbas
功能: 10进制转换n进制
n进制转换10进制
n可为2、8、10、32、62<?php <br />
/*<br>
* ===========================================<br>
* 进制转换<br>
* 功能: 10进制转换n进制<br>
n进制转换10进制<br>
* ===========================================<br>
*/<br>
class IntSwitch{<br>
<br>
public function __construct(){<br>
$this->key = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; //默认密钥<br>
$this->carry = 1; //默认进位<br>
}<br>
<br>
//普通整数N进制转换，将$raw转换为$ary，文本长度为$len<br>
public function changeInt($raw,$ary,$len){<br>
//变量初始化<br>
$result = ""; //结果<br>
$variable = 1; //临时变量<br>
$residue = 1; //余数<br>
$median = 1; //文本长度<br>
$verify = $raw; //原数值 <br>
if ($raw == 0) <br>
$result = substr($this->key,0,$this->carry);<br>
while($raw != 0){<br>
$variable = intval($raw / $ary);<br>
$residue = $raw % $ary;<br>
$result = substr($this->key,$residue*$this->carry,$this->carry).$result;<br>
$raw = $variable;<br>
}<br>
$median = strlen($result);//取结果文本长度<br>
if ($median
$result = $this->fillPlace($len-$median).$result;<br>
if ($this->revertInt($ary,$result)!=$verify)<br>
return -1;<br>
return $result;<br>
<br>
}<br>
<br>
//普通整数N进制反转换<br>
public function revertInt($ary,$value){<br>
//变量初始化<br>
$result = "";<br>
$median = intval(strlen($value)/$this->carry);<br>
$character = ""; <br>
for ($i=1;$i
if ($this->carry>1){//多进位进制转换 <br>
$character = substr($value,$i*$this->carry-($this->carry),$this->carry); <br>
$result += (intval(strpos($this->key,$character)/$this->carry))*pow($ary,$median - $i);<br>
}else{//单进位进制转换 <br>
$character = substr($value,$i*$this->carry-1,$this->carry);<br>
$result += intval(strpos($this->key,$character))*pow($ary,$median - $i);<br>
}<br>
}<br>
return $result;<br>
}<br>
<br>
//大整数N进制转换，将$raw转换为$ary，文本长度为$len<br>
public function changeBigInt($raw,$ary,$len){<br>
//变量初始化<br>
bcscale(0); //设置没有小数位。<br>
$result = ""; //结果<br>
$variable = 1; //临时变量<br>
$residue = 1; //余数<br>
$median = 1; //文本长度<br>
$verify = $raw; //原数值<br>
if ($raw == "0") <br>
$result = substr($this->key,0,$this->carry);<br>
while($raw != "0"){<br>
$variable = bcdiv($raw,$ary);<br>
$residue = bcmod($raw,$ary);<br>
$result = substr($this->key,$residue*$this->carry,$this->carry).$result;<br>
$raw = $variable;<br>
}<br>
$median = strlen($result);//取结果文本长度<br>
if ($median
$result = $this->fillPlace($len-$median).$result;<br>
if ($this->revertBigInt($ary,$result)!=$verify)<br>
return -1;<br>
return $result;<br>
<br>
}<br>
<br>
//大整数N进制反转换<br>
public function revertBigInt($ary,$value){<br>
//变量初始化<br>
bcscale(0); //设置没有小数位。<br>
$result = "";<br>
$median = bcdiv(strlen($value),$this->carry);<br>
$character = ""; <br>
for ($i=1;$i
if ($this->carry>1){//多进位进制转换 <br>
$character = substr($value,$i*$this->carry-($this->carry),$this->carry); <br>
$result = bcadd(bcmul(bcdiv(strpos($this->key,$character),$this->carry),bcpow($ary,$median - $i)),$result);<br>
}else{//单进位进制转换 <br>
$character = substr($value,$i*$this->carry-1,$this->carry);<br>
$result = bcadd(bcmul(strpos($this->key,$character),bcpow($ary,$median - $i)),$result);<br>
}<br>
}<br>
return $result;<br>
}<br>
<br>
//补位函数<br>
public function fillPlace($number){<br>
$character = substr($this->key,0,$this->carry);//取默认为0的字符。<br>
$result = $character;<br>
for ($i=1;$i
$result.=$character; <br>
return $result;<br>
}<br>
}<br>
<br>
$raw = "19999999999";//数据<br>
$ary = 62;//进制<br>
$len = 6;//位数，0为自动<br>
$is = new IntSwitch;<br>
$result = $is->changeBigInt($raw,$ary,$len);<br>
$revert=$is->revertBigInt($ary,$result);<br>
echo "<font><b>$raw </b></font> 转换为 $ary 进制 = <font><b>$result </b></font><br>";<br>
echo "实际长度：".strlen($result)."<br>";<br>
echo "还原数据：".$revert."<br>";
IntSwitch.class.zip
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