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。
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<?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:
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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:
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<?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:
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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!