PHP implementation of conversion between different operating systems _ PHP Tutorial

PHP implements conversion between different operating systems. There is a requirement in the project: Convert decimal to binary, octal, and hexadecimal, as well as binary, octal, and hexadecimal to decimal. record the following, in the future, there will be a requirement in the project, that is, convert the decimal to binary, octal, and hexadecimal, and convert the binary, octal, and hexadecimal to decimal. record the following, you can use it later.

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. The following are decimal conversion to binary, octal, and hexadecimal:

 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 ;}

The test results are as follows:

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"}

Convert binary, octal, and hexadecimal to decimal by multiplication, for example, convert 1101 to decimal: 1*2 ^ 3 + 1*2 ^ 2 + 0*2 ^ 1 + 1*2 ^ 0. The program design is as follows:

 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 ;}

The test is as follows:

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 (). here is just the implementation idea.

There are also two-in-one (eight-in-one) and hexadecimal (ten-in-ten). The following is a record for later use...