Php method for reading torrent seed file (available for test) _ PHP

This article mainly introduces how php can read torrent seed file content. it can read and display torrent seed file content, which is simple and practical, for more information about how to use php to read torrent files, see the following example. We will share this with you for your reference. The details are as follows:

<? Php/*** Class xBEncoder * Author: Angus. fenying * Version: 0.1 * Date: 2014-06-03 ** This class helps stringify or parse BENC * codes. ** All Copyrights 2007-2014 Fenying Studio Reserved. */class xBEncoder {const READY = 0; const READ_STR = 1; const READ_DICT = 2; const READ_LIST = 3; const READ_INT = 4; const READ_KEY = 5; public $ y; protected $ z, $ m, $ n; protected $ stat; protected $ stack ;/* ** This method saves the status of current * encode/decode work. */protected function push ($ newY, $ newStat) {array_push ($ this-> stack, array ($ this-> y, $ this-> z, $ this-> m, $ this-> n, $ this-> stat); list ($ this-> y, $ this-> z, $ this-> m, $ this-> n, $ this-> stat) = array ($ newY, 0, 0, 0, $ newStat );} /*** This method restore the saved status of current * encode/decode work. */protected function pop () {$ T = array_pop ($ this-> stack); if ($ t) {if ($ t [4] = self: READ_DICT) {$ t [0]-> {$ t [1] }=$ this-> y; $ t [1] = 0 ;} elseif ($ t [4] = self: READ_LIST) $ t [0] [] = $ this-> y; list ($ this-> y, $ this-> z, $ this-> m, $ this-> n, $ this-> stat) = $ t ;}} /*** This method initializes the status of work. * YOU shoshould call this method before everything. */public function init () {$ this-> stat = self: READY; $ this-> stack = Array (); $ this-> z = $ this-> m = $ this-> n = 0 ;} /*** This method decode $ s ($ l as length ). * You can get $ obj-> y as the result. */public function decode ($ s, $ l) {$ this-> y = 0; for ($ I = 0; $ I <$ l; ++ $ I) {switch ($ this-> stat) {case self: READY: if ($ s [$ I] = 'd ') {$ this-> y = new xBDict (); $ this-> stat = self: READ_DICT;} elseif ($ s [$ I] = 'l ') {$ this-> y = array (); $ this-> stat = self: READ_L IST;} break; case self: READ_INT: if ($ s [$ I] = 'e') {$ this-> y-> val = substr ($ s, $ this-> m, $ I-$ this-> m); $ this-> pop ();} break; case self: READ_STR: if (xBInt :: isNum ($ s [$ I]) continue; if ($ s [$ I] = ':') {$ this-> z = substr ($ s, $ this-> m, $ I-$ this-> m); $ this-> y = substr ($ s, $ I + 1, $ this-> z + 0); $ I + = $ this-> z; $ this-> pop ();} break; case self: READ_KEY: if (xBInt:: isNum ($ s [$ I]) continue; if ($ S [$ I] = ':') {$ this-> n = substr ($ s, $ this-> m, $ I-$ this-> m ); $ this-> z = substr ($ s, $ I + 1, $ this-> n + 0); $ I + = $ this-> n; $ this-> stat = self: READ_DICT;} break; case self: READ_DICT: if ($ s [$ I] = 'e ') {$ this-> pop (); break;} elseif (! $ This-> z) {$ this-> m = $ I; $ this-> stat = self: READ_KEY; break;} case self: READ_LIST: switch ($ s [$ I]) {case 'e': $ this-> pop (); break; case 'D ': $ this-> push (new xBDict (), self: READ_DICT); break; case 'I': $ this-> push (new xBInt (), self :: READ_INT); $ this-> m = $ I + 1; break; case 'L': $ this-> push (array (), self: READ_LIST); break; default: if (xBInt: isNum ($ s [$ I]) {$ this-> push ('', self: READ_STR ); $ this-> m = $ I ;}} break ;}$ rtn = empty ($ this-> stack); $ this-> init (); return $ rtn ;} /*** This method encode $ obj-> y into BEncode. */public function encode () {return $ this-> _ encDo ($ this-> y);} protected function _ encStr ($ str) {return strlen ($ str ). ':'. $ str;} protected function _ encDo ($ o) {if (is_string ($ o) return $ this-> _ encStr ($ o); if ($ o instanceof xBInt) return 'I '. $ o-> val. 'E'; if ($ o instanceof xBDict) {$ r = 'd'; foreach ($ o as $ k => $ c) $ r. = $ this-> _ encStr ($ k ). $ this-> _ encDo ($ c); return $ r. 'E';} if (is_array ($ o) {$ r = 'l'; foreach ($ o as $ c) $ r. = $ this-> _ encDo ($ c); return $ r. 'E' ;}} class xBDict {} class xBInt {public $ val; public function _ construct ($ val = 0) {$ this-> val = $ val ;} public static function isNum ($ chr) {$ chr = ord ($ chr); if ($ chr <= 57 & $ chr> = 48) return true; return false; }}// use instance $ s = file_get_contents ("test. torrent "); $ bc = new xBEncoder (); $ bc-> init (); $ bc-> decode ($ s, strlen ($ s )); var_dump ($ bc-> y );