php 实现进制相互转换,php进制相互转换
php 实现进制相互转换,php进制相互转换
从十进制向其它进制转换,用的是就用该数字不断除以要转换的进制数,读取余数。连接一起就可以了。
<?php /** *十进制转二进制、八进制、十六进制 不足位数前面补零* * * @param array $datalist 传入数据array(100,123,130) * @param int $bin 转换的进制可以是:2,8,16 * @return array 返回数据 array() 返回没有数据转换的格式 */ function decto_bin($datalist,$bin) { static $arr=array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F'); if(!is_array($datalist)) $datalist=array($datalist); if($bin==10)return $datalist; //相同进制忽略 $bytelen=ceil(16/$bin); //获得如果是$bin进制,一个字节的长度 $aOutChar=array(); foreach ($datalist as $num) { $t=""; $num=intval($num); if($num===0)continue; while($num>0) { $t=$arr[$num%$bin].$t; $num=floor($num/$bin); } $tlen=strlen($t); if($tlen%$bytelen!=0) { $pad_len=$bytelen-$tlen%$bytelen; $t=str_pad("",$pad_len,"0",STR_PAD_LEFT).$t; //不足一个字节长度,自动前面补充0 } $aOutChar[]=$t; } return $aOutChar; }
测试:
var_dump(decto_bin(array(128,253),2)); var_dump(decto_bin(array(128,253),8)); var_dump(decto_bin(array(128,253),16)); X-Powered-By: PHP/5.2.0 Content-type: text/html array(2) { [0]=> string(8) "10000000" [1]=> string(8) "11111101" } array(2) { [0]=> string(4) "0200" [1]=> string(4) "0375" } array(2) { [0]=> string(2) "80" [1]=> string(2) "FD" }
二进制、八进制、十六进制转十进制
这个转换用乘法,如:1101 转十进制:1*2^3+1*2^2+0*2^1+1*2^0
代码:
<?php /** *二进制、八进制、十六进制 转十进制* * * @param array $datalist 传入数据array(df,ef) * @param int $bin 转换的进制可以是:2,8,16 * @return array 返回数据 array() 返回没有数据转换的格式 * @copyright chengmo QQ:8292669 */ function bin_todec($datalist,$bin) { static $arr=array('0'=>0,'1'=>1,'2'=>2,'3'=>3,'4'=>4,'5'=>5,'6'=>6,'7'=>7,'8'=>8,'9'=>9,'A'=>10,'B'=>11,'C'=>12,'D'=>13,'E'=>14,'F'=>15); if(!is_array($datalist))$datalist=array($datalist); if($bin==10)return $datalist; //为10进制不转换 $aOutData=array(); //定义输出保存数组 foreach ($datalist as $num) { $atnum=str_split($num); //将字符串分割为单个字符数组 $atlen=count($atnum); $total=0; $i=1; foreach ($atnum as $tv) { $tv=strtoupper($tv); if(array_key_exists($tv,$arr)) { if($arr[$tv]==0)continue; $total=$total+$arr[$tv]*pow($bin,$atlen-$i); } $i++; } $aOutData[]=$total; } return $aOutData; }
测试:
var_dump(bin_todec(array('ff','ff33','cc33'),16)); var_dump(bin_todec(array('1101101','111101101'),2)); var_dump(bin_todec(array('1234123','12341'),8)); X-Powered-By: PHP/5.2.0 Content-type: text/html array(3) { [0]=> int(255) [1]=> int(65331) [2]=> int(52275) } array(2) { [0]=> int(124) [1]=> int(508) } array(2) { [0]=> int(342099) [1]=> int(5345) }
这些只是实现方式,其实不在乎php语言还是其它,实现思路都是一样的。php其实内置不少函数可以完成这些内容:
bindec(),decoct(),dechex() base_convert() decbin() 这里只是实现思路而已。呵呵!
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