PHP实例开发源码-红鸟Sessions类 v1.0.zip

<? //connect mysql $z_conn = mysql_connect($z_dbhost,$z_dbuser,$z_dbpass); if(!$z_conn) die(); //select database $z_select_db = mysql_select_db($z_dbname,$z_conn); if(!$z_select_db) die(); //set charset if(version_compare(mysql_get_client_info(),'5.0.7','>=') && version_compare(PHP_VERSION,'5.2.3','>=')){ mysql_set_charset($z_charset); }else{ mysql_query("SET NAMES {$z_charset}"); } //open function z_s_open($z_s_path,$z_s_name){ return true; } //close function z_s_close(){ return true; } //read function z_s_read($zr_s_id){ global $z_dtable; $zr_sql="select s_value from {$z_dtable} where s_id like '{$zr_s_id}' and s_expired > ".time(); $zr_query=mysql_query($zr_sql); if(list($zr_value)=mysql_fetch_row($zr_query)){ return $zr_value; }else{ return false; } } //write function z_s_write($zw_s_id,$zw_s_value){ global $z_lifetime,$z_dtable; $zw_expired = time()+$z_lifetime; $zw_value = $zw_s_value; mysql_query("delete from {$z_dtable} where s_id like '{$zw_s_id}' and s_expired < ".time()); mysql_query("select id from {$z_dtable} where s_id like '{$zw_s_id}'"); if(mysql_affected_rows() > 0){ $zw_query = mysql_query("update {$z_dtable} set s_expired = '{$zw_expired}',s_value='{$zw_value}' where s_id like '{$zw_s_id}' and s_expired > ".time()); }else{ $zw_query = mysql_query("insert into {$z_dtable} (s_id,s_expired,s_value) values ('{$zw_s_id}','{$zw_expired}','{$zw_value}')"); } return $zw_query; } //destroy function z_s_destroy($zd_s_id){ global $z_dtable; $zd_query = mysql_query("delete from {$z_dtable} where s_id like '{$zd_s_id}' limit 1"); return $zd_query; } //gc function z_s_gc($z_s_maxlifetime){ return true; } //delete expired sessions function z_del_sessions(){ global $z_dtable; mysql_query("delete from {$z_dtable} where s_expired < ".time()); mysql_query("optimize table {$z_dtable}"); } //z_gc function gc_mt_rand($gc_t=20){ $r = mt_rand(0,99); if($r < $gc_t) return true; return false; } //gc delete expired sessions if(gc_mt_rand($z_probability)){z_del_sessions();} //set handler,session start if(ini_get("session.auto_start")==0){ ini_set("session.save_handler",'user'); session_module_name('user'); session_set_save_handler('z_s_open','z_s_close','z_s_read','z_s_write','z_s_destroy','z_s_gc'); session_start(); } ?>