PHP enables binary, octal, and hexadecimal conversions to each other

/** * decimal-to-binary, octal, hex-less digits 0 * * * @param array $datalist incoming data array (100,123,130) * The binary @param int $bin conversion can be: 2,8,16 * @return Array return data array () returns no data conversion format * @Author Chengmo qq:8292669 * @copyright Http://www.cnblogs.com/chengmo */ function Decto_bin ($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; Same binary Ignore $bytelen =ceil (16/$bin); Get the length of a byte if it is a $bin binary $aOutChar =array (); foreach ($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; Less than one byte length, auto front add 0 } $aOutChar []= $t; } return $aOutChar; } Test: 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" } Copy Code Binary, octal, hexadecimal to decimal This conversion is multiplied, for example: 1101 to decimal: 1*2^3+1*2^2+0*2^1+1*2^0 /** * Binary, octal, hexadecimal to decimal * * * @param array $datalist incoming data array (DF,EF) * The binary @param int $bin conversion can be: 2,8,16 * @return Array return data array () returns no data conversion format * @copyright Chengmo qq:8292669 */ function Bin_todec ($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; No conversion for 10 binary $aOutData =array (); Define output Save Array foreach ($datalist as $num) { $atnum =str_split ($num); Splitting a string into a single character array $atlen =count ($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; } Test: 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) } Copy Code PHP actually has a few built-in functions to do this: Bindec (), Decoct (), Dechex () Base_convert () Decbin () Here is just the idea of implementation.

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