PHP整数N进制转换，短网址ID转换

php中文网

发布时间：2016-06-07 11:45:09

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来源于php中文网

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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
/* * =========================================== * 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 $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." ";