php 使用session实现数据库交互类的解决办法
内容摘要
这篇文章主要为大家详细介绍了php 使用session实现数据库交互类的简单示例,具有一定的参考价值,可以用来参考一下。
对此感兴趣的朋友,看看idc笔记做的技术笔记。经测试代码如
对此感兴趣的朋友,看看idc笔记做的技术笔记。经测试代码如
文章正文
这篇文章主要为大家详细介绍了php 使用session实现数据库交互类的简单示例,具有一定的参考价值,可以用来参考一下。
对此感兴趣的朋友,看看idc笔记做的技术笔记。经测试代码如下:1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 | <code class = "php" > /** * session 数据库存储类 * * @param * @author php教程 www.idcnote.com **/ class Session { private static $session_id = 0; private static $session_data = array (); private static $is_update = FALSE; private static $is_del = FALSE; private static $is_gc = FALSE; private static $dbo = NULL; //数据库连接句柄 private static $gc_max_time = 1440; private static $table = 'sessions' ; private static $pre_key = 'weige' ; //session 密钥 //捆绑使用哈 private static $gc_rate_de = 100; //代表分母 private static $gc_rate_co = 20; //代表分子 private static $path = '/' ; //保存路径 private static $domain = null; //域 private static $secure = false; //默认 private static $httponly = false; //默认 /** * 获取数据库句柄 私有 */ private static function open() { if (!self:: $dbo ) { self:: $dbo = Db::factory(); } return TRUE; } /** * 设置 * */ public static function set( $key , $val =NULL) { self::open(); $data = self::read(); if ( $data === FALSE) { $data = array (); } if (! $val && is_array ( $key )) { $data = $key ; } else if ( $val && is_string ( $key )) { $data [ $key ] = $val ; } self::write( $data ); self::close(); } /** *获取值 * */ public static function get( $key =NULL) { self::open(); self:: $session_data = self::read(); $ret = '' ; if (! $key ) { $ret = self:: $session_data ; } else if ( is_array (self:: $session_data ) && isset(self:: $session_data [ $key ])) { $ret = self:: $session_data [ $key ]; } self::update(); self::close(); return $ret ; } /** * 删除或者重置 * */ public static function del( $key ) { if (!self:: $is_del ) { self::open(); $val = self::read(); if (isset( $val [ $key ])) { unset( $val [ $key ]); } $session_id = self:: $session_id ; $session_data = serialize( $val ); $session_expire = TIME + self::get_gc_maxtime(); self:: $dbo ->query( "update " .self:: $table . " set value='$session_data', expiry='$session_expire' where session_id='$session_id'" ); self::close(); } self:: $is_del = TRUE; } /** * 销毁 * * */ public static function destroy() { $session_id = self::get_session_id(); $_COOKIE [ 'WBSID' ] = '' ; self::open(); self:: $dbo ->query( "delete from " .self:: $table . " where session_id='$session_id'" ); self::close(); } /** * 读取 私有 * */ private static function read() { $session_id = self:: $session_id ; if (! $session_id ) { $session_id = self::get_session_id(); } if (! $session_id ) return array (); $user_agent = isset( $_SERVER [ 'HTTP_USER_AGENT' ]) ? md5( $_SERVER [ 'HTTP_USER_AGENT' ]) : '' ; $client_ip = Fun::getIp(); $session_expire = TIME - self::get_gc_maxtime(); $rs = self:: $dbo ->fetchRow( "select session_id, value, agent, ip from " .self:: $table ." where session_id= '$session_id' and expiry> '$session_expire' "); if (! $rs || $rs [ 'agent' ] != $user_agent || $rs [ 'ip' ] != $client_ip ) { return FALSE; } self:: $session_id = $rs [ 'session_id' ]; return unserialize( $rs [ 'value' ]); } /** * session 写入 私有 * */ private static function write( array $session_data ) { $session_id = self:: $session_id ; if (! $session_id ) { $session_id = self::get_session_id(); } $session_expire = TIME + self::get_gc_maxtime(); $user_agent = isset( $_SERVER [ 'HTTP_USER_AGENT' ]) ? md5( $_SERVER [ 'HTTP_USER_AGENT' ]) : '' ; $client_ip = Fun::getIp(); $session_data = serialize( $session_data ); if (self:: $session_id && self:: $session_id === $session_id ) { self:: $dbo ->query( "update " .self:: $table . " set value='$session_data', expiry='$session_expire', agent='$user_agent', ip='$client_ip' where session_id='$session_id'" ); } else { self:: $session_id = $session_id = self::create_session_id(); self:: $dbo ->query( "insert into " .self:: $table ."(session_id, value, expiry, agent, ip) values( '$session_id' , '$session_data' , '$session_expire' , '$user_agent' , '$client_ip' )"); } return true; } /** * session 更新 私有 * */ private static function update() { if (!self:: $is_update ) { $session_id = self:: $session_id ; $session_expire = TIME + self::get_gc_maxtime(); self:: $dbo ->query( "update " .self:: $table . " set expiry='$session_expire' where session_id='$session_id'" ); } self:: $is_update = TRUE; } private static function close() { if (!self:: $is_gc && mt_rand(1, self:: $gc_rate_de )%self:: $gc_rate_co == 0) { self::gc(); } self:: $is_gc = TRUE; } /** * 过期session 清除 随机触发 * */ private static function gc() { $session_expire = TIME - self::get_gc_maxtime(); self:: $dbo ->query( "delete from " .self:: $table . " where expiry<'$session_expire'" ); } private static function get_session_id() { if (isset( $_COOKIE [ 'WBSID' ]) && strlen ( $_COOKIE [ 'WBSID' ])==32) { $sid = $_COOKIE [ 'WBSID' ]; setcookie( 'WBSID' , $sid , TIME + self::get_gc_maxtime(), self:: $path , self:: $domain , self:: $secure , self:: $httponly ); return $sid ; } return null; } private static function create_session_id() { $sid = self::get_session_id(); if (! $sid ) { $sid = Fun::getIp() . TIME . microtime(TRUE) . mt_rand(mt_rand(0, 100), mt_rand(100000, 90000000)); $sid = md5(self:: $pre_key . $sid ); setcookie( 'WBSID' , substr ( $sid , 0, 32), TIME + self::get_gc_maxtime(), self:: $path , self:: $domain , self:: $secure , self:: $httponly ); } return $sid ; } public static function get_gc_maxtime() { return self:: $gc_max_time ; } } /*** 代码来自php教程(www.idcnote.com) ***/ </code> |
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