Store PHP session data to database code instances and session data storage
A development environment has multiple websites and requires different sessions. There are many solutions. However, this is also a big move, with data inventory to facilitate future expansion.
PostgreSQL
First, the database
--drop table php_sessioncreate unlogged table php_session( sess_id varchar(32) primary key, modify_time timestamp with time zone not null, sess_data varchar(3000) default '');create index concurrently idx_php_session_modify_time on php_session(modify_time);--set_session(id, data)create or replace function set_session(varchar, varchar) returns void as $set_session$ with upsert as ( update php_session set modify_time = current_timestamp, sess_data = $2 where sess_id = $1 returning 1 ) insert into php_session (sess_id, modify_time, sess_data) select $1, current_timestamp, $2 where not exists ( select 1 from upsert );$set_session$ language sql;--get_session(id)create or replace function get_session(varchar) returns varchar as $get_session$ select sess_data from php_session where sess_id = $1$get_session$ language sql;--del_sessioncreate or replace function del_session(varchar) returns void as $del_session$ delete from php_session where sess_id = $1$del_session$ language sql;--gc_sessioncreate or replace function gc_session() returns void as $del_session$ delete from php_session where modify_time < current_timestamp - interval '30 days'$del_session$ language sql;
And then the PHP part.
<?phpsession_set_save_handler( function ($savePath, $sessionName) {//open return true; }, function () {//close return true; }, function ($id) {//read $sql = "select get_session($1)"; $stmt = pg_query_params(SESSION_CONN, $sql, array($id)); $result = pg_fetch_row($stmt); return $result[0]; }, function ($id, $data) {//write $sql = "select set_session($1, $2)"; pg_query_params(SESSION_CONN, $sql, array($id, $data)); return true; }, function ($id) {//destroy $sql = "select del_session($1)"; pg_query_params(SESSION_CONN, $sql, array($id, $data)); return true; }, function ($maxlifetime) {//gc //php needn't control the global session gc return true; });register_shutdown_function('session_write_close');?>
Then you only need to call this before session_start.
As for SESSION_CONN, it is a constant defined by me, indicating a link to the session database.
MySQL
Here is an example of integrating more basic functions for MySQL:
Table Structure:
CREATE TABLE IF NOT EXISTS `sessioninfo` ( `sid` varchar(255) NOT NULL, `value` text NOT NULL, `expiration` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`sid`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Session information is stored in the database class:
Class MySessionHandler implements SessionHandlerInterface {/*** @ access private * @ var object database connection */private $ _ dbLink; /*** @ access private * @ var string name of the table in which the session is saved */Private $ _ sessionTable; /*** @ access private * @ var string session name */private $ _ sessionName;/*** @ const expiration time */const SESSION_EXPIRE = 10; public function _ construct ($ dbLink, $ sessionTable) {if (! Is_object ($ dbLink) {return false;} $ this-> _ dbLink = $ dbLink; $ this-> _ sessionTable = $ sessionTable ;} /*** open * @ access public * @ param string $ session_save_path to save the session path * @ param string $ session_name session name * @ return integer */public function open ($ session_save_path, $ session_name) {$ this-> _ sessionName = $ session_name; return 0;}/*** close * @ access public * @ return integer */public fu Nction close () {return 0;}/*** close session * @ access public * @ param string $ session_id session ID * @ return string */public function read ($ session_id) {$ query = "SELECT value FROM {$ this-> _ sessionTable} WHERE sid = {$ session_id} AND UNIX_TIMESTAMP (expiration) + ". self: SESSION_EXPIRE. "> UNIX_TIMESTAMP (NOW ()"; $ result = $ this-> _ dbLink-> query ($ query); if (! Isset ($ value) | empty ($ value) {$ value = ""; return $ value ;} $ this-> _ dbLink-> query ("UPDATE {$ this-> _ sessionTable} SET expiration = CURRENT_TIMESTAMP () WHERE sid = {$ session_id }"); $ value = $ result-> fetch_array (); $ result-> free (); return $ value ['value'];} /*** write session ** @ access public * @ param string $ session_id session ID * @ param string $ session_data session data * @ return integer */public Function write ($ session_id, $ session_data) {$ query = "SELECT value FROM {$ this-> _ sessionTable} WHERE sid = '{$ session_id}' AND UNIX_TIMESTAMP (expiration) + ". self: SESSION_EXPIRE. "> UNIX_TIMESTAMP (NOW ()"; $ result = $ this-> _ dbLink-> query ($ query); $ result = $ result-> fetch_array (); if (! Empty ($ result )) {$ result = $ this-> _ dbLink-> query ("UPDATE {$ this-> _ sessionTable} SET value = {$ session_data} WHERE sid = {$ session_id }") ;} else {$ result = $ this-> _ dbLink-> query ("insert into {$ this-> _ sessionTable} (sid, value) VALUES ('{$ session_id }', '{$ session_data}') ");} if ($ result) {return 0;} else {return 1 ;}} /*** ecstasy session * @ access public * @ param string $ session_id session ID * @ return integer */public function destroy ($ session_id) {$ result = $ this-> _ dbLink-> query ("delete from {$ this-> _ sessionTable} WHERE sid = '{$ session_id }'"); if ($ result) {return 0;} else {return 1 ;}} /*** garbage collection ** @ access public * @ param string $ maxlifetime session maximum survival time * @ return integer */public function gc ($ maxlifetime) {$ result = $ this-> _ dbLink-> query ("delete from {$ this-> _ sessionTable} WHERE UNIX_TIMESTAMP (expiration) <UNIX_TIMESTAMP (NOW ())-". self: SESSION_EXPIRE); if ($ result) {return 0 ;}else {return 1 ;}}}
$dbLink = new mysqli("localhost", "root", "root", "test");$sessionTable = "sessioninfo"; $handler = new MySessionHandler($dbLink, $sessionTable);session_set_save_handler($handler);session_start();$_SESSION['name'] = "test";echo $_SESSION["name"];//session_destroy();