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A class that replaces phpsession with a mysql memory table-php Tutorial

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A class that replaces phpsession with a mysql memory table

  2. /**
  3. * Session mysql memory table
  4. @ Usage: use some other storage method (mysql or memcache) instead of php sessoin
  5. @ Author: lein
  6. @ Version: 1.2
  7. */
  8. Session_start ();
  9. If (! Isset ($ _ SESSION ['test']) {
  10. $ _ SESSION ['test'] = "123_lein _". date ("Y-m-d H: I: s ");
  11. }
  13. Class session {
  14. // Session data
  15. Private $ data;
  16. // Engine, mysql or memcache
  17. Private $ engine;
  18. // Php session expire time
  19. Private $ sessionexpiredTime;
  20. // Current user's session cookie value
  21. Private $ sessionID;
  22. // Session coolie name
  23. Private $ sessionCookieName;
  24. Public function session ($ engineBase = NULL, $ engineName = 'mysql', $ storage_name = 'php _ session '){
  25. Try {
  26. $ This-> sessionexpiredTime = intval (ini_get ("session. cache_expire") * 10; // The default value is 180 minutes, which is too long and changed to 30 minutes.
  27. } Catch (Exception $ Exception ){
  28. $ This-> sessionexpiredTime = 1200;
  29. }
  30. Try {
  31. $ This-> sessionCookieName = ini_get ("session. name ");
  32. } Catch (Exception $ Exception ){
  33. $ This-> sessionCookieName = 'phpsessid ';
  34. }
  36. If (! Isset ($ _ COOKIE [$ this-> sessionCookieName]) {
  37. @ Session_start ();
  38. $ This-> sessionID = session_id ();
  39. } Else {
  40. $ This-> sessionID =$ _ COOKIE [$ this-> sessionCookieName];
  41. }
  42. $ ClassName = $ engineName. "SessionEngine ";
  43. $ This-> engine = new $ className (
  44. Array (
  45. 'Storage _ name' => $ storage_name, // mysql table name or memcahce key which stores data;
  46. 'Expire _ time' => $ this-> sessionexpiredTime,
  47. 'Data _ too_long_instead_value '=>' {__ data IS * $ * to long __}'
  48. ),
  49. $ This-> sessionID,
  50. & $ EngineBase
  51. );
  52. $ This-> init ();
  53. $ This-> loadFromSession ();
  54. $ This-> engine-> refresh ();
  55. $ This-> engine-> cleanup ();
  56. }
  57. Private function init ()
  58. {
  59. $ This-> data = $ this-> engine-> get ();
  60. If (empty ($ this-> data )){
  61. @ Session_start ();
  62. If (! Empty ($ _ SESSION )){
  63. $ This-> data =$ _ SESSION;
  64. $ This-> engine-> create (false, $ this-> data );
  65. }
  66. Else
  67. {
  68. $ This-> engine-> create (false ,"");
  69. }
  70. }
  71. }
  72. Public function loadFromSession ($ flagStartSession = false ){
  73. $ Flag = false;
  74. If ($ flagStartSession ){
  75. @ Session_start ();
  76. }
  77. If ($ _ SESSION & is_array ($ _ SESSION )){
  78. Foreach ($ _ SESSION as $ k => $ v ){
  79. If (! Isset ($ this-> data [$ k]) {
  80. $ This-> data [$ k] = $ v;
  81. $ Flag = true;
  82. }
  83. }
  84. }
  85. If ($ flag ){
  86. $ This-> engine-> set (false, $ this-> data );
  87. }
  88. }
  89. Private function _ get ($ nm)
  90. {
  91. If (isset ($ this-> data [$ nm]) {
  92. $ R = $ this-> data [$ nm];
  93. Return $ r;
  94. }
  95. Else
  96. {
  97. Return NULL;
  98. }
  99. }
  100. Private function _ set ($ nm, $ val)
  101. {
  102. $ This-> data [$ nm] = $ val;
  103. $ This-> engine-> set (false, $ this-> data );
  104. }
  106. Private function _ isset ($ nm)
  107. {
  108. Return isset ($ this-> data [$ nm]);
  109. }
  111. Private function _ unset ($ nm)
  112. {
  113. Unset ($ this-> data [$ nm]);
  114. $ This-> engine-> set (false, $ this-> data );
  115. }
  117. Function _ destruct (){
  118. $ This-> data = NULL;
  119. $ This-> engine-> close ();
  120. $ This-> engine = NULL;
  121. }
  122. }
  124. Interface SessionEngine
  125. {
  126. /*
  127. * Set varibles
  128. * @ Param $ arr array, array (varible name => varible value ,...)
  129. */
  130. Public function setVariable ($ arr );
  131. /*
  132. * Get session value
  133. * @ Param $ key string
  134. */
  135. Public function get ($ key = "");
  136. /*
  137. * Set session value
  138. * @ Param $ key string
  139. * @ Param $ value string
  140. */
  141. Public function set ($ key = "", $ value = "");
  142. /*
  143. * Set session value
  144. * @ Param $ key string
  145. * @ Param $ value string
  146. */
  147. Public function create ($ key = "", $ value = "");
  148. /*
  149. * Update the session's invalid time
  150. * @ Param $ key string
  151. */
  152. Public function refresh ($ key = "");
  153. /*
  154. * Close mysql or memcache connection
  155. */
  156. Public function close ();
  157. /*
  158. * Delete expired sessions
  159. */
  160. Public function cleanup ();
  161. }
  163. Final class mysqlSessionEngine implements SessionEngine {
  164. Private $ id = "";
  165. Private $ storage_name = 'php _ session ';
  166. Private $ storage_name_slow = 'php _ session_slow ';
  167. Private $ data_too_long_instead_value = '{__ data is ~ To long __} '; // if data is longer than $ max_session_data_length and you are using mysql 4 or below, insert this value into memery table instead.
  168. Private $ expire_time = 1200;
  169. Private $ max_session_data_length = 2048;
  170. Private $ conn;
  171. Private $ mysql_version;
  172. Public function mysqlSessionEngine ($ arr = array (), $ key = "", & $ _ conn ){
  173. $ This-> setVariable ($ arr );
  174. $ This-> id = $ key;
  175. If (empty ($ this-> id) | strlen ($ this-> id )! = 32 ){
  176. Throw new Exception (_ FILE __. "-> ". _ LINE __. ": Session's cookie name can't be empty and it must have just 32 charactors! ");
  177. }
  178. $ This-> conn =$ _ conn;
  179. If (! $ This-> conn |! Is_resource ($ this-> conn )){
  180. Throw new Exception (_ FILE _. "->". _ LINE _. ": Need a mysql connection! ");
  181. }
  182. $ This-> mysql_version = $ this-> getOne ("select floor (version ())");
  183. If ($ this-> mysql_version <5 ){
  184. $ This-> max_session_data_length = 255;
  185. }
  186. }
  187. Public function setVariable ($ arr ){
  188. If (! Empty ($ arr) & is_array ($ arr )){
  189. Foreach ($ arr as $ k =>$ v ){
  190. $ This-> $ k = $ v;
  191. If ($ k = 'Storage _ name '){
  192. $ This-> storage_name_slow = $ v. '_ slow ';
  193. }
  194. }
  195. }
  196. }
  197. Public function get ($ key = ""){
  198. If ($ key = "") $ key = $ this-> id;
  199. $ Return = $ this-> getOne ('select value from '. $ this-> storage_name. 'where id = "'. $ key .'"');
  200. If ($ return = $ this-> data_too_long_instead_value)
  201. {
  202. $ Return = $ this-> getOne ('select value from '. $ this-> storage_name_slow. 'where id = "'. $ key .'"');
  203. }
  204. If (! $ Return)
  205. {
  206. $ MysqlError = mysql_error ($ this-> conn );
  207. If (strpos ($ mysqlError, "doesn't exist ")! = False)
  208. {
  209. $ This-> initTable ();
  210. }
  211. $ Return = array ();
  212. }
  213. Else
  214. {
  215. $ Return = unserialize ($ return );
  216. }
  217. Return $ return;
  218. }
  219. Public function close (){
  220. @ Mysql_close ($ this-> conn );
  221. }
  222. Public function cleanup (){
  223. If ($ this-> mysql_version> 4 ){
  224. $ SQL = 'delete from'. $ this-> storage_name. 'where date_add ('time', INTERVAL '. $ this-> expire_time. 'second) } Else {
  225. $ SQL = 'delete from'. $ this-> storage_name_slow. 'where 'time' + '. $ this-> expire_time .' If ($ _ SESSION ['username'] = "leinchu "){
  226. Echo $ SQL;
  227. }
  228. $ This-> execute ($ SQL );
  229. $ SQL = 'delete from'. $ this-> storage_name. 'where 'time' + '. $ this-> expire_time .' If ($ _ SESSION ['username'] = "leinchu "){
  230. Echo $ SQL;
  231. }
  232. }
  233. $ This-> execute ($ SQL );
  234. }
  235. Public function refresh ($ key = ""){
  236. If ($ this-> mysql_version> 4 ){
  237. $ SQL = 'update'. $ this-> storage_name. 'set'time' = CURRENT_TIMESTAMP () where id = "'. $ key .'"';
  238. } Else {
  239. $ SQL = 'update'. $ this-> storage_name. 'set'time' = unix_timestamp () where id = "'. $ key .'"';
  240. }
  241. $ Return = $ this-> execute ($ SQL );
  242. If (! $ Return ){
  243. $ This-> initTable ();
  244. $ Return = $ this-> execute ($ SQL, true );
  245. }
  246. Return $ return;
  247. }
  248. Public function create ($ key = "", $ value = ""){
  249. If ($ key = "") $ key = $ this-> id;
  250. If ($ value! = "") $ Value = mysql_real_escape_string (serialize ($ value), $ this-> conn );
  251. If (strlen ($ value)> $ this-> max_session_data_length)
  252. {
  253. If ($ this-> mysql_version> 4 ){
  254. Throw new Exception (_ FILE __. "-> ". _ LINE __. ": Session data is long than max allow length (". $ this-> max_session_data_length. ")! ");
  255. }
  256. }
  257. If ($ this-> mysql_version> 4 ){
  258. $ SQL = 'replace '. $ this-> storage_name. 'set value = /''. $ value. '/', id = "'. $ key. '", 'Time' = CURRENT_TIMESTAMP ()';
  259. } Else {
  260. $ SQL = 'replace '. $ this-> storage_name. 'set value = /''. $ value. '/', id = "'. $ key. '", 'Time' = unix_timestamp ()';
  261. }
  262. $ Return = $ this-> execute ($ SQL );
  263. If (! $ Return ){
  264. $ This-> initTable ();
  265. $ Return = $ this-> execute ($ SQL, true );
  266. }
  267. Return $ return;
  268. }
  269. Public function set ($ key = "", $ value = ""){
  270. If ($ key = "") $ key = $ this-> id;
  271. If ($ value! = "") $ Value = mysql_real_escape_string (serialize ($ value), $ this-> conn );
  272. $ SQL = 'update'. $ this-> storage_name. 'set value =/'. $ value.'/'Where id = "'. $ key .'"';
  273. If (strlen ($ value)> $ this-> max_session_data_length)
  274. {
  275. If ($ this-> mysql_version> 4 ){
  276. Throw new Exception (_ FILE __. "-> ". _ LINE __. ": Session data is long than max allow length (". $ this-> max_session_data_length. ")! ");
  277. }
  278. $ SQL = 'replace '. $ this-> storage_name_slow. 'set value = /''. $ value. '/', id = "'. $ key. '", 'Time' = unix_timestamp ()';
  279. $ This-> execute ($ SQL, true );
  280. $ SQL = 'update '. $ this-> storage_name. 'set value = /''. $ this-> data_too_long_instead_value. '/'Where id = "'. $ key. '"';
  281. }
  282. $ Return = $ this-> execute ($ SQL );
  283. If (! $ Return ){
  284. $ This-> initTable ();
  285. $ Return = $ this-> execute ($ SQL, true );
  286. }
  287. Return $ return;
  288. }
  289. Private function initTable (){
  290. If ($ this-> mysql_version> 4 ){
  291. $ SQL ="
  292. Create table if not exists "'. $ this-> storage_name ."'(
  293. 'Id' char (32) not null default 'err ',
  294. 'Value' VARBINARY (". $ this-> max_session_data_length.") NULL,
  295. 'Time' timestamp not null default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
  296. Primary key ('id '),
  297. KEY 'time' ('time ')
  298. ) ENGINE = MEMORY;
  299. ";
  300. } Else {
  301. $ SqlSlow ="
  302. Create table if not exists "'. $ this-> storage_name." _ slow '(
  303. 'Id' char (32) not null default 'err ',
  304. 'Value' text NULL,
  305. 'Time' int (10) not null default '0 ',
  306. Primary key ('id '),
  307. KEY 'time' ('time ')
  308. ) ENGINE = MyISAM;
  309. ";
  310. $ This-> execute ($ sqlSlow, true );
  312. $ SQL ="
  313. Create table if not exists "'. $ this-> storage_name ."'(
  314. 'Id' char (32) not null default 'err ',
  315. 'Value' VARCHAR (255) NULL,
  316. 'Time' int (10) not null default '0 ',
  317. Primary key ('id '),
  318. KEY 'time' ('time ')
  319. ) ENGINE = MEMORY;
  320. ";
  321. }
  322. Return $ this-> execute ($ SQL, true );
  323. }
  324. Private function execute ($ SQL, $ die = false)
  325. {
  326. If ($ die)
  327. {
  328. Mysql_query ($ SQL, $ this-> conn) or die ("exe SQL error:
    ". Mysql_error ()."
    ". $ SQL ."");
  329. }
  330. Else
  331. {
  332. Mysql_query ($ SQL, $ this-> conn );
  333. If (mysql_error ()){
  334. Return false;
  335. } Else {
  336. Return true;
  337. }
  338. }
  339. }
  340. Private function getOne ($ SQL, $ die = false ){
  341. $ Rs = $ this-> query ($ SQL, $ die );
  342. If ($ rs & ($ one = mysql_fetch_row ($ rs ))){
  343. Return $ one [0];
  344. } Else {
  345. Return false;
  346. }
  347. }
  348. Private function query ($ SQL, $ die = false ){
  349. If ($ die)
  350. $ Rs = mysql_query ($ SQL, $ this-> conn) or die ("query SQL error:
    ". Mysql_error ()."
    ". $ SQL ."");
  351. Else
  352. $ Rs = mysql_query ($ SQL, $ this-> conn );
  353. Return $ rs;
  354. }
  355. }
  356. $ Lnk = mysql_connect ('localhost', 'root', '123 ')
  357. Or die ('not ccted: '. mysql_error ());
  359. // Make foo the current db
  360. Mysql_select_db ('test', $ lnk) or die ('Can/'t use foo: '. mysql_error ());
  361. $ S = new session ($ lnk );
  362. If (! $ S-> last ){
  363. $ S-> last = time ();
  364. }
  365. Echo "First visit at". $ S-> last ."
    ";
  366. If (! $ S-> lastv ){
  367. $ S-> lastv = 0;
  368. }
  369. $ S-> lastv ++;
  370. Echo "lastv =". $ S-> lastv ."
    ";
  371. Echo "test =". $ S-> test ."
    ";
  372. If (isset ($ _ GET ['Max ']) {
  373. $ S-> boom = str_repeat ("OK", 255 );
  374. }
  375. If (isset ($ _ GET ['boom ']) {
  376. $ S-> boom = $ _ GET ['boom '];
  377. }
  378. Echo "boom =". $ S-> boom ."
    ";
  379. ?>

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