<?php
/*
* ===========================================
* 进制转换
* 功能: 10进制转换n进制
n进制转换10进制
* ===========================================
*/
class IntSwitch{
public function __construct(){
$this->key = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; //默认密钥
$this->carry = 1; //默认进位
}
//普通整数N进制转换,将$raw转换为$ary,文本长度为$len
public function changeInt($raw,$ary,$len){
//变量初始化
$result = ""; //结果
$variable = 1; //临时变量
$residue = 1; //余数
$median = 1; //文本长度
$verify = $raw; //原数值
if ($raw == 0)
$result = substr($this->key,0,$this->carry);
while($raw != 0){
$variable = intval($raw / $ary);
$residue = $raw % $ary;
$result = substr($this->key,$residue*$this->carry,$this->carry).$result;
$raw = $variable;
}
$median = strlen($result);//取结果文本长度
if ($median<$len)//如果不够位数则补短
$result = $this->fillPlace($len-$median).$result;
if ($this->revertInt($ary,$result)!=$verify)
return -1;
return $result;
}
//普通整数N进制反转换
public function revertInt($ary,$value){
//变量初始化
$result = "";
$median = intval(strlen($value)/$this->carry);
$character = "";
for ($i=1;$i<=$median;$i++){
if ($this->carry>1){//多进位进制转换
$character = substr($value,$i*$this->carry-($this->carry),$this->carry);
$result += (intval(strpos($this->key,$character)/$this->carry))*pow($ary,$median - $i);
}else{//单进位进制转换
$character = substr($value,$i*$this->carry-1,$this->carry);
$result += intval(strpos($this->key,$character))*pow($ary,$median - $i);
}
}
return $result;
}
//大整数N进制转换,将$raw转换为$ary,文本长度为$len
public function changeBigInt($raw,$ary,$len){
//变量初始化
bcscale(0); //设置没有小数位。
$result = ""; //结果
$variable = 1; //临时变量
$residue = 1; //余数
$median = 1; //文本长度
$verify = $raw; //原数值
if ($raw == "0")
$result = substr($this->key,0,$this->carry);
while($raw != "0"){
$variable = bcdiv($raw,$ary);
$residue = bcmod($raw,$ary);
$result = substr($this->key,$residue*$this->carry,$this->carry).$result;
$raw = $variable;
}
$median = strlen($result);//取结果文本长度
if ($median<$len)//如果不够位数则补短
$result = $this->fillPlace($len-$median).$result;
if ($this->revertBigInt($ary,$result)!=$verify)
return -1;
return $result;
}
//大整数N进制反转换
public function revertBigInt($ary,$value){
//变量初始化
bcscale(0); //设置没有小数位。
$result = "";
$median = bcdiv(strlen($value),$this->carry);
$character = "";
for ($i=1;$i<=$median;$i++){
if ($this->carry>1){//多进位进制转换
$character = substr($value,$i*$this->carry-($this->carry),$this->carry);
$result = bcadd(bcmul(bcdiv(strpos($this->key,$character),$this->carry),bcpow($ary,$median - $i)),$result);
}else{//单进位进制转换
$character = substr($value,$i*$this->carry-1,$this->carry);
$result = bcadd(bcmul(strpos($this->key,$character),bcpow($ary,$median - $i)),$result);
}
}
return $result;
}
//补位函数
public function fillPlace($number){
$character = substr($this->key,0,$this->carry);//取默认为0的字符。
$result = $character;
for ($i=1;$i<=$number-1;$i++)
$result.=$character;
return $result;
}
}
$raw = "19999999999";//数据
$ary = 62;//进制
$len = 6;//位数,0为自动
$is = new IntSwitch;
$result = $is->changeBigInt($raw,$ary,$len);
$revert=$is->revertBigInt($ary,$result);
echo "<font color='#ff0000'><b>$raw </b></font> 转换为 $ary 进制 = <font color='#0000ff'><b>$result </b></font><br>";
echo "实际长度:".strlen($result)."<br>";
echo "还原数据:".$revert."<br>"; 附件 IntSwitch.class.zip ( 1.2 KB 下载:223 次 )
ThinkPHP 是一个免费开源的,快速、简单的面向对象的 轻量级PHP开发框架 ,创立于2006年初,遵循Apache2开源协议发布,是为了敏捷WEB应用开发和简化企业应用开发而诞生的。ThinkPHP从诞生以来一直秉承简洁实用的设计原则,在保持出色的性能和至简的代码的同时,也注重易用性。并且拥有众多的原创功能和特性,在社区团队的积极参与下,在易用性、扩展性和性能方面不断优化和改进,已经成长为国内最领先和最具影响力的WEB应用开发框架,众多的典型案例确保可以稳定用于商业以及门户级的开发。