Php converts binary, octal, and hexadecimal formats.

Php converts binary, octal, and hexadecimal formats.

/** * Convert decimal to binary, octal, or hexadecimal with zero padding before the digits being insufficient * * * @ Param array $ datalist input data array (100,123,130) * @ Param int $ bin conversion can be: 2, 8, 16 * @ Return array returns the data array () and returns the format in which no data is converted. * @ Author chengmo QQ: 8292669 * @ Copyright http://www.cnblogs.com/chengmo */ 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 in the same hexadecimal format $ Bytelen = ceil (16/$ bin); // Obtain the length of a byte in $ bin notation. $ 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; // The length of less than one byte is automatically increased to 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" } II,Binary, octal, and hexadecimal to decimalThis conversion uses multiplication, for example: 1101 to decimal: 1*2 ^ 3 + 1*2 ^ 2 + 0*2 ^ 1 + 1*2 ^ 0 /** * Convert binary, octal, and hexadecimal to decimal * * * @ Param array $ datalist input data array (df, ef) * @ Param int $ bin conversion can be: 2, 8, 16 * @ Return array returns the data array () and returns the format in which no data is converted. * @ 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 to the 10th hexadecimal format $ AOutData = array (); // defines the output to save the array Foreach ($ datalist as $ num) { $ Atnum = str_split ($ num); // splits 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 ('20140901', '20160901'), 2 )); Var_dump (bin_todec (array ('20140901', '20160901'), 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) } Php actually has many built-in functions to accomplish this: bindec (), decoct (), dechex () base_convert () decbin (). here is just the implementation idea.