Php implements mutual conversion of hexadecimal values, and php conversion of hexadecimal values

Php implements mutual conversion of hexadecimal values, and php conversion of hexadecimal values

To convert from decimal to other hexadecimal values, the number is used to continuously divide by the number of hexadecimal values to be converted and read the remainder. Connect them together.

<? Php/*** convert decimal to binary, octal, and hexadecimal digits to zero before digits *** @ param array $ datalist input data array (100,123,130) * @ param int $ bin conversion can be:, 16 * @ return array returns the data array () to return the format without data conversion */function decto_bin ($ datalist, $ bin) {static $ arr = array (, 'A', 'B', 'C', 'D', 'E ', 'F'); if (! Is_array ($ datalist) $ datalist = array ($ datalist); if ($ bin = 10) return $ datalist; // ignore $ bytelen = ceil (16/$ bin) in the same hexadecimal format; // obtain the length of one byte $ aOutChar = array () If $ bin is used (); 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; // The length of less than one byte. The value 0 is automatically added before.} $ 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/5.2.0Content-type: text/htmlarray(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"}

Binary, octal, and hexadecimal to decimal

This conversion uses multiplication, for example: 1101 to decimal: 1*2 ^ 3 + 1*2 ^ 2 + 0*2 ^ 1 + 1*2 ^ 0

Code:

<? Php/*** convert binary, octal, and hexadecimal to decimal *** @ param array $ datalist input data array (df, ef) * @ param int $ bin conversion can be in the format of, 16 * @ return array returned data array () returned format without data conversion * @ 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; // do not convert $ aOutData = array (); // define the output to save the array foreach ($ datalist as $ num) {$ atnum = str_split ($ num ); // split the 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/5.2.0Content-type: text/htmlarray(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)}

These are just implementation methods. In fact, php or other languages are not concerned, and the Implementation ideas are the same. Php actually has many built-in functions to accomplish this:

Bindec (), decoct (), dechex () base_convert () decbin () is just the implementation idea here. Haha!

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