n进制转换10进制
n可为2、8、10、32、62
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 $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;$i if ($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 $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;$i if ($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 $result.=$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 $raw 转换为 $ary 进制 = $result
;
echo 实际长度：.strlen($result).
;
echo 还原数据：.$revert.
;
intswitch.class.zip ( 1.2 kb 下载：211 次 )
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