大数 进制转换 10-16
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10-16 <?php ????function?dec2hex($str)????{ ????????$hex?=?array('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'); ????????$hexval?=?''; ????????$quotient?=?$str; ????????$divisor?=?$str; ????????$flag?=?true; ????????while($flag) ????????{ ????????????$len?=?strlen($divisor); ????????????$pos?=?1; ????????????$quotient?=?0; ????????????$div?=?substr($divisor,?0,?2); ????????????$remainder?=?$div[0]; ????????????while($pos?<?$len) ????????????{ ????????????????$div?=?$remainder?==?0???$divisor[$pos]?:?$remainder.$divisor[$pos]; ????????????????$remainder?=?$div?%?16; ????????????????$quotient?=?$quotient.floor($div/16); ????????????????$pos++; ????????????} ????????????$quotient?=?trim_left_zeros($quotient); ????????????$divisor?=?"$quotient"; ????????????$hexval?=?$hex[$remainder].$hexval; ????????????if?(strlen($divisor)<=2) ????????????????if?($divisor<15) ????????????????{ ????????????????????$flag?=?false; ????????????????} ????????} ????????$hexval?=?$hex[$quotient].$hexval; ????????$hexval?=?trim_left_zeros($hexval); ????????return?$hexval; ????} ????function?trim_left_zeros($str) ????????$str?=?ltrim($str,?'0'); ????????if?(empty($str)) ????????????$str?=?'0'; ????????return?$str; ???? ????$hex?=?dec2hex('10153302696068'); ????if($hex%2!=0)?$hex?=?'0'.?$hex; ????$str?=?str_split($hex,2); ????$out?=?''; ????for($i=0;$i<count($str);$i++) ??????$out?=?'x'?.?$str[$i]?.?$out; ????$out?=?$out.'x00 0'; ????echo?$out; ???? ?> 16-10 <?php function convBase($numberInput,$fromBaseInput,$toBaseInput) { ? ? if ($fromBaseInput==$toBaseInput) return $numberInput; ? ? $fromBase = str_split($fromBaseInput,1); ? ? $toBase = str_split($toBaseInput,1); ? ? $number = str_split($numberInput,1); ? ? $fromLen=strlen($fromBaseInput); ? ? $toLen=strlen($toBaseInput); ? ? $numberLen=strlen($numberInput); ? ? $retval=''; ? ? if ($toBaseInput == '0123456789') ? ? { ? ? ? ? $retval=0; ? ? ? ? for ($i = 1;$i <= $numberLen; $i++) ? ? ? ? ? ? $retval = bcadd($retval,bcmul(array_search($number[$i-1],$fromBase),bcpow($fromLen,$numberLen-$i))); ? ? ? ? return $retval; ? ? } ? ? if ($fromBaseInput != '0123456789') ? ? ? ? $base10=convBase($numberInput,'0123456789'); ? ? else ? ? ? ? $base10 = $numberInput; ? ? if ($base10<strlen($toBaseInput)) ? ? ? ? return $toBase[$base10]; ? ? while($base10 != '0') ? ? { ? ? ? ? $retval = $toBase[bcmod($base10,$toLen)].$retval; ? ? ? ? $base10 = bcdiv($base10,$toLen,0); ? ? } ? ? return $retval; } $btime = microtime(true); echo convBase('c4ca4238a0b923820dcc509a6f75849b','0123456789abcdef','0123456789'); echo microtime(true) - $btime; ?> （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |