[2] | 1 | <?php |
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| 2 | /* |
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[34] | 3 | V4.93 10 Oct 2006 (c) 2000-2007 John Lim (jlim#natsoft.com.my). All rights reserved. |
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[2] | 4 | Released under both BSD license and Lesser GPL library license. |
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| 5 | Whenever there is any discrepancy between the two licenses, |
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| 6 | the BSD license will take precedence. |
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| 7 | Set tabs to 4 for best viewing. |
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| 8 | |
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| 9 | Latest version of ADODB is available at http://php.weblogs.com/adodb |
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| 10 | ====================================================================== |
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| 11 | |
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| 12 | This file provides PHP4 session management using the ADODB database |
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| 13 | wrapper library. |
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| 14 | |
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| 15 | Example |
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| 16 | ======= |
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| 17 | |
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| 18 | include('adodb.inc.php'); |
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| 19 | include('adodb-session.php'); |
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| 20 | session_start(); |
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[34] | 21 | $_SESSION['AVAR'] += 1; |
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| 22 | print " |
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| 23 | -- \$_SESSION['AVAR']={$_SESSION['AVAR']}</p>"; |
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[2] | 24 | |
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| 25 | To force non-persistent connections, call adodb_session_open first before session_start(): |
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| 26 | |
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| 27 | include('adodb.inc.php'); |
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| 28 | include('adodb-session.php'); |
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| 29 | adodb_sess_open(false,false,false); |
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| 30 | session_start(); |
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[34] | 31 | $_SESSION['AVAR'] += 1; |
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| 32 | print " |
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| 33 | -- \$_SESSION['AVAR']={$_SESSION['AVAR']}</p>"; |
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[2] | 34 | |
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| 35 | |
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| 36 | Installation |
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| 37 | ============ |
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| 38 | 1. Create this table in your database (syntax might vary depending on your db): |
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| 39 | |
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| 40 | create table sessions ( |
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| 41 | SESSKEY char(32) not null, |
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| 42 | EXPIRY int(11) unsigned not null, |
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| 43 | EXPIREREF varchar(64), |
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| 44 | DATA text not null, |
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| 45 | primary key (sesskey) |
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| 46 | ); |
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| 47 | |
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| 48 | For oracle: |
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| 49 | create table sessions ( |
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| 50 | SESSKEY char(32) not null, |
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| 51 | EXPIRY DECIMAL(16) not null, |
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| 52 | EXPIREREF varchar(64), |
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| 53 | DATA varchar(4000) not null, |
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| 54 | primary key (sesskey) |
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| 55 | ); |
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| 56 | |
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| 57 | |
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| 58 | 2. Then define the following parameters. You can either modify |
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| 59 | this file, or define them before this file is included: |
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| 60 | |
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| 61 | $ADODB_SESSION_DRIVER='database driver, eg. mysql or ibase'; |
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| 62 | $ADODB_SESSION_CONNECT='server to connect to'; |
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| 63 | $ADODB_SESSION_USER ='user'; |
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| 64 | $ADODB_SESSION_PWD ='password'; |
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| 65 | $ADODB_SESSION_DB ='database'; |
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| 66 | $ADODB_SESSION_TBL = 'sessions' |
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| 67 | |
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[34] | 68 | 3. Recommended is PHP 4.1.0 or later. There are documented |
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[2] | 69 | session bugs in earlier versions of PHP. |
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| 70 | |
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| 71 | 4. If you want to receive notifications when a session expires, then |
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| 72 | you can tag a session with an EXPIREREF, and before the session |
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| 73 | record is deleted, we can call a function that will pass the EXPIREREF |
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| 74 | as the first parameter, and the session key as the second parameter. |
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| 75 | |
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| 76 | To do this, define a notification function, say NotifyFn: |
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| 77 | |
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| 78 | function NotifyFn($expireref, $sesskey) |
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| 79 | { |
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| 80 | } |
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| 81 | |
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| 82 | Then you need to define a global variable $ADODB_SESSION_EXPIRE_NOTIFY. |
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| 83 | This is an array with 2 elements, the first being the name of the variable |
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| 84 | you would like to store in the EXPIREREF field, and the 2nd is the |
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| 85 | notification function's name. |
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| 86 | |
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| 87 | In this example, we want to be notified when a user's session |
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| 88 | has expired, so we store the user id in the global variable $USERID, |
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| 89 | store this value in the EXPIREREF field: |
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| 90 | |
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| 91 | $ADODB_SESSION_EXPIRE_NOTIFY = array('USERID','NotifyFn'); |
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| 92 | |
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| 93 | Then when the NotifyFn is called, we are passed the $USERID as the first |
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| 94 | parameter, eg. NotifyFn($userid, $sesskey). |
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| 95 | */ |
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| 96 | |
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| 97 | if (!defined('_ADODB_LAYER')) { |
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| 98 | include (dirname(__FILE__).'/adodb.inc.php'); |
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| 99 | } |
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| 100 | |
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| 101 | if (!defined('ADODB_SESSION')) { |
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| 102 | |
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| 103 | define('ADODB_SESSION',1); |
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| 104 | |
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| 105 | /* if database time and system time is difference is greater than this, then give warning */ |
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| 106 | define('ADODB_SESSION_SYNCH_SECS',60); |
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| 107 | |
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[34] | 108 | /* |
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| 109 | Thanks Joe Li. See http://phplens.com/lens/lensforum/msgs.php?id=11487&x=1 |
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| 110 | */ |
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| 111 | function adodb_session_regenerate_id() |
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| 112 | { |
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| 113 | $conn =& ADODB_Session::_conn(); |
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| 114 | if (!$conn) return false; |
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| 115 | |
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| 116 | $old_id = session_id(); |
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| 117 | if (function_exists('session_regenerate_id')) { |
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| 118 | session_regenerate_id(); |
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| 119 | } else { |
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| 120 | session_id(md5(uniqid(rand(), true))); |
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| 121 | $ck = session_get_cookie_params(); |
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[1057] | 122 | setcookie(session_name(), session_id(), false, $ck['path'], $ck['domain'], $ck['secure'],true); |
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[34] | 123 | //@session_start(); |
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| 124 | } |
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| 125 | $new_id = session_id(); |
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| 126 | $ok =& $conn->Execute('UPDATE '. ADODB_Session::table(). ' SET sesskey='. $conn->qstr($new_id). ' WHERE sesskey='.$conn->qstr($old_id)); |
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| 127 | |
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| 128 | /* it is possible that the update statement fails due to a collision */ |
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| 129 | if (!$ok) { |
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| 130 | session_id($old_id); |
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| 131 | if (empty($ck)) $ck = session_get_cookie_params(); |
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[1057] | 132 | setcookie(session_name(), session_id(), false, $ck['path'], $ck['domain'], $ck['secure'],true); |
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[34] | 133 | return false; |
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| 134 | } |
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| 135 | |
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| 136 | return true; |
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| 137 | } |
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| 138 | |
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[2] | 139 | /****************************************************************************************\ |
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| 140 | Global definitions |
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| 141 | \****************************************************************************************/ |
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| 142 | GLOBAL $ADODB_SESSION_CONNECT, |
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| 143 | $ADODB_SESSION_DRIVER, |
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| 144 | $ADODB_SESSION_USER, |
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| 145 | $ADODB_SESSION_PWD, |
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| 146 | $ADODB_SESSION_DB, |
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| 147 | $ADODB_SESS_CONN, |
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| 148 | $ADODB_SESS_LIFE, |
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| 149 | $ADODB_SESS_DEBUG, |
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| 150 | $ADODB_SESSION_EXPIRE_NOTIFY, |
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| 151 | $ADODB_SESSION_CRC, |
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| 152 | $ADODB_SESSION_TBL; |
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| 153 | |
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| 154 | |
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| 155 | $ADODB_SESS_LIFE = ini_get('session.gc_maxlifetime'); |
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| 156 | if ($ADODB_SESS_LIFE <= 1) { |
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| 157 | // bug in PHP 4.0.3 pl 1 -- how about other versions? |
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| 158 | //print "<h3>Session Error: PHP.INI setting <i>session.gc_maxlifetime</i>not set: $ADODB_SESS_LIFE</h3>"; |
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| 159 | $ADODB_SESS_LIFE=1440; |
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| 160 | } |
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| 161 | $ADODB_SESSION_CRC = false; |
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| 162 | //$ADODB_SESS_DEBUG = true; |
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| 163 | |
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| 164 | ////////////////////////////////// |
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| 165 | /* SET THE FOLLOWING PARAMETERS */ |
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| 166 | ////////////////////////////////// |
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| 167 | |
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| 168 | if (empty($ADODB_SESSION_DRIVER)) { |
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| 169 | $ADODB_SESSION_DRIVER='mysql'; |
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| 170 | $ADODB_SESSION_CONNECT='localhost'; |
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| 171 | $ADODB_SESSION_USER ='root'; |
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| 172 | $ADODB_SESSION_PWD =''; |
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| 173 | $ADODB_SESSION_DB ='xphplens_2'; |
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| 174 | } |
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| 175 | |
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| 176 | if (empty($ADODB_SESSION_EXPIRE_NOTIFY)) { |
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| 177 | $ADODB_SESSION_EXPIRE_NOTIFY = false; |
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| 178 | } |
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| 179 | // Made table name configurable - by David Johnson djohnson@inpro.net |
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| 180 | if (empty($ADODB_SESSION_TBL)){ |
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| 181 | $ADODB_SESSION_TBL = 'sessions'; |
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| 182 | } |
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| 183 | |
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| 184 | /* |
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| 185 | $ADODB_SESS['driver'] = $ADODB_SESSION_DRIVER; |
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| 186 | $ADODB_SESS['connect'] = $ADODB_SESSION_CONNECT; |
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| 187 | $ADODB_SESS['user'] = $ADODB_SESSION_USER; |
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| 188 | $ADODB_SESS['pwd'] = $ADODB_SESSION_PWD; |
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| 189 | $ADODB_SESS['db'] = $ADODB_SESSION_DB; |
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| 190 | $ADODB_SESS['life'] = $ADODB_SESS_LIFE; |
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| 191 | $ADODB_SESS['debug'] = $ADODB_SESS_DEBUG; |
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| 192 | |
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| 193 | $ADODB_SESS['debug'] = $ADODB_SESS_DEBUG; |
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| 194 | $ADODB_SESS['table'] = $ADODB_SESS_TBL; |
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| 195 | */ |
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| 196 | |
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| 197 | /****************************************************************************************\ |
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| 198 | Create the connection to the database. |
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| 199 | |
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| 200 | If $ADODB_SESS_CONN already exists, reuse that connection |
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| 201 | \****************************************************************************************/ |
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| 202 | function adodb_sess_open($save_path, $session_name,$persist=true) |
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| 203 | { |
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| 204 | GLOBAL $ADODB_SESS_CONN; |
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| 205 | if (isset($ADODB_SESS_CONN)) return true; |
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| 206 | |
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| 207 | GLOBAL $ADODB_SESSION_CONNECT, |
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| 208 | $ADODB_SESSION_DRIVER, |
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| 209 | $ADODB_SESSION_USER, |
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| 210 | $ADODB_SESSION_PWD, |
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| 211 | $ADODB_SESSION_DB, |
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| 212 | $ADODB_SESS_DEBUG; |
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| 213 | |
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| 214 | // cannot use & below - do not know why... |
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| 215 | $ADODB_SESS_CONN = ADONewConnection($ADODB_SESSION_DRIVER); |
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| 216 | if (!empty($ADODB_SESS_DEBUG)) { |
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| 217 | $ADODB_SESS_CONN->debug = true; |
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| 218 | ADOConnection::outp( " conn=$ADODB_SESSION_CONNECT user=$ADODB_SESSION_USER pwd=$ADODB_SESSION_PWD db=$ADODB_SESSION_DB "); |
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| 219 | } |
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| 220 | if ($persist) $ok = $ADODB_SESS_CONN->PConnect($ADODB_SESSION_CONNECT, |
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| 221 | $ADODB_SESSION_USER,$ADODB_SESSION_PWD,$ADODB_SESSION_DB); |
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| 222 | else $ok = $ADODB_SESS_CONN->Connect($ADODB_SESSION_CONNECT, |
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| 223 | $ADODB_SESSION_USER,$ADODB_SESSION_PWD,$ADODB_SESSION_DB); |
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| 224 | |
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[34] | 225 | if (!$ok) ADOConnection::outp( " |
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| 226 | -- Session: connection failed</p>",false); |
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[2] | 227 | } |
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| 228 | |
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| 229 | /****************************************************************************************\ |
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| 230 | Close the connection |
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| 231 | \****************************************************************************************/ |
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| 232 | function adodb_sess_close() |
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| 233 | { |
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| 234 | global $ADODB_SESS_CONN; |
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| 235 | |
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| 236 | if ($ADODB_SESS_CONN) $ADODB_SESS_CONN->Close(); |
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| 237 | return true; |
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| 238 | } |
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| 239 | |
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| 240 | /****************************************************************************************\ |
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| 241 | Slurp in the session variables and return the serialized string |
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| 242 | \****************************************************************************************/ |
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| 243 | function adodb_sess_read($key) |
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| 244 | { |
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| 245 | global $ADODB_SESS_CONN,$ADODB_SESSION_TBL,$ADODB_SESSION_CRC; |
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| 246 | |
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| 247 | $rs = $ADODB_SESS_CONN->Execute("SELECT data FROM $ADODB_SESSION_TBL WHERE sesskey = '$key' AND expiry >= " . time()); |
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| 248 | if ($rs) { |
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| 249 | if ($rs->EOF) { |
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| 250 | $v = ''; |
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| 251 | } else |
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| 252 | $v = rawurldecode(reset($rs->fields)); |
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| 253 | |
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| 254 | $rs->Close(); |
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| 255 | |
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| 256 | // new optimization adodb 2.1 |
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| 257 | $ADODB_SESSION_CRC = strlen($v).crc32($v); |
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| 258 | |
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| 259 | return $v; |
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| 260 | } |
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| 261 | |
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| 262 | return ''; // thx to Jorma Tuomainen, webmaster#wizactive.com |
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| 263 | } |
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| 264 | |
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| 265 | /****************************************************************************************\ |
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| 266 | Write the serialized data to a database. |
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| 267 | |
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| 268 | If the data has not been modified since adodb_sess_read(), we do not write. |
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| 269 | \****************************************************************************************/ |
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| 270 | function adodb_sess_write($key, $val) |
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| 271 | { |
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| 272 | global |
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| 273 | $ADODB_SESS_CONN, |
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| 274 | $ADODB_SESS_LIFE, |
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| 275 | $ADODB_SESSION_TBL, |
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| 276 | $ADODB_SESS_DEBUG, |
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| 277 | $ADODB_SESSION_CRC, |
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| 278 | $ADODB_SESSION_EXPIRE_NOTIFY; |
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| 279 | |
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| 280 | $expiry = time() + $ADODB_SESS_LIFE; |
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| 281 | |
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| 282 | // crc32 optimization since adodb 2.1 |
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| 283 | // now we only update expiry date, thx to sebastian thom in adodb 2.32 |
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| 284 | if ($ADODB_SESSION_CRC !== false && $ADODB_SESSION_CRC == strlen($val).crc32($val)) { |
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[34] | 285 | if ($ADODB_SESS_DEBUG) echo " |
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| 286 | -- Session: Only updating date - crc32 not changed</p>"; |
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[2] | 287 | $qry = "UPDATE $ADODB_SESSION_TBL SET expiry=$expiry WHERE sesskey='$key' AND expiry >= " . time(); |
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| 288 | $rs = $ADODB_SESS_CONN->Execute($qry); |
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| 289 | return true; |
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| 290 | } |
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| 291 | $val = rawurlencode($val); |
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| 292 | |
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| 293 | $arr = array('sesskey' => $key, 'expiry' => $expiry, 'data' => $val); |
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| 294 | if ($ADODB_SESSION_EXPIRE_NOTIFY) { |
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| 295 | $var = reset($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 296 | global $$var; |
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| 297 | $arr['expireref'] = $$var; |
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| 298 | } |
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| 299 | $rs = $ADODB_SESS_CONN->Replace($ADODB_SESSION_TBL,$arr, |
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| 300 | 'sesskey',$autoQuote = true); |
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| 301 | |
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| 302 | if (!$rs) { |
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[34] | 303 | ADOConnection::outp( ' |
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| 304 | -- Session Replace: '.$ADODB_SESS_CONN->ErrorMsg().'</p>',false); |
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[2] | 305 | } else { |
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| 306 | // bug in access driver (could be odbc?) means that info is not commited |
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| 307 | // properly unless select statement executed in Win2000 |
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| 308 | if ($ADODB_SESS_CONN->databaseType == 'access') |
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| 309 | $rs = $ADODB_SESS_CONN->Execute("select sesskey from $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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| 310 | } |
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| 311 | return !empty($rs); |
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| 312 | } |
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| 313 | |
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| 314 | function adodb_sess_destroy($key) |
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| 315 | { |
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| 316 | global $ADODB_SESS_CONN, $ADODB_SESSION_TBL,$ADODB_SESSION_EXPIRE_NOTIFY; |
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| 317 | |
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| 318 | if ($ADODB_SESSION_EXPIRE_NOTIFY) { |
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| 319 | reset($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 320 | $fn = next($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 321 | $savem = $ADODB_SESS_CONN->SetFetchMode(ADODB_FETCH_NUM); |
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| 322 | $rs = $ADODB_SESS_CONN->Execute("SELECT expireref,sesskey FROM $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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| 323 | $ADODB_SESS_CONN->SetFetchMode($savem); |
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| 324 | if ($rs) { |
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| 325 | $ADODB_SESS_CONN->BeginTrans(); |
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| 326 | while (!$rs->EOF) { |
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| 327 | $ref = $rs->fields[0]; |
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| 328 | $key = $rs->fields[1]; |
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| 329 | $fn($ref,$key); |
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| 330 | $del = $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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| 331 | $rs->MoveNext(); |
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| 332 | } |
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| 333 | $ADODB_SESS_CONN->CommitTrans(); |
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| 334 | } |
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| 335 | } else { |
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| 336 | $qry = "DELETE FROM $ADODB_SESSION_TBL WHERE sesskey = '$key'"; |
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| 337 | $rs = $ADODB_SESS_CONN->Execute($qry); |
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| 338 | } |
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| 339 | return $rs ? true : false; |
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| 340 | } |
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| 341 | |
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| 342 | function adodb_sess_gc($maxlifetime) |
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| 343 | { |
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| 344 | global $ADODB_SESS_DEBUG, $ADODB_SESS_CONN, $ADODB_SESSION_TBL,$ADODB_SESSION_EXPIRE_NOTIFY; |
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| 345 | |
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| 346 | if ($ADODB_SESSION_EXPIRE_NOTIFY) { |
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| 347 | reset($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 348 | $fn = next($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 349 | $savem = $ADODB_SESS_CONN->SetFetchMode(ADODB_FETCH_NUM); |
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| 350 | $t = time(); |
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| 351 | $rs =& $ADODB_SESS_CONN->Execute("SELECT expireref,sesskey FROM $ADODB_SESSION_TBL WHERE expiry < $t"); |
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| 352 | $ADODB_SESS_CONN->SetFetchMode($savem); |
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| 353 | if ($rs) { |
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| 354 | $ADODB_SESS_CONN->BeginTrans(); |
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| 355 | while (!$rs->EOF) { |
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| 356 | $ref = $rs->fields[0]; |
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| 357 | $key = $rs->fields[1]; |
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| 358 | $fn($ref,$key); |
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| 359 | $del = $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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| 360 | $rs->MoveNext(); |
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| 361 | } |
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| 362 | $rs->Close(); |
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| 363 | |
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| 364 | $ADODB_SESS_CONN->CommitTrans(); |
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| 365 | |
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| 366 | } |
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| 367 | } else { |
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| 368 | $qry = "DELETE FROM $ADODB_SESSION_TBL WHERE expiry < " . time(); |
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| 369 | $ADODB_SESS_CONN->Execute($qry); |
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| 370 | |
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[34] | 371 | if ($ADODB_SESS_DEBUG) ADOConnection::outp(" |
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| 372 | -- <b>Garbage Collection</b>: $qry</p>"); |
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[2] | 373 | } |
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| 374 | // suggested by Cameron, "GaM3R" <gamr@outworld.cx> |
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| 375 | if (defined('ADODB_SESSION_OPTIMIZE')) { |
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| 376 | global $ADODB_SESSION_DRIVER; |
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| 377 | |
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| 378 | switch( $ADODB_SESSION_DRIVER ) { |
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| 379 | case 'mysql': |
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| 380 | case 'mysqlt': |
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| 381 | $opt_qry = 'OPTIMIZE TABLE '.$ADODB_SESSION_TBL; |
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| 382 | break; |
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| 383 | case 'postgresql': |
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| 384 | case 'postgresql7': |
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| 385 | $opt_qry = 'VACUUM '.$ADODB_SESSION_TBL; |
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| 386 | break; |
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| 387 | } |
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| 388 | if (!empty($opt_qry)) { |
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| 389 | $ADODB_SESS_CONN->Execute($opt_qry); |
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| 390 | } |
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| 391 | } |
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| 392 | if ($ADODB_SESS_CONN->dataProvider === 'oci8') $sql = 'select TO_CHAR('.($ADODB_SESS_CONN->sysTimeStamp).', \'RRRR-MM-DD HH24:MI:SS\') from '. $ADODB_SESSION_TBL; |
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| 393 | else $sql = 'select '.$ADODB_SESS_CONN->sysTimeStamp.' from '. $ADODB_SESSION_TBL; |
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| 394 | |
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| 395 | $rs =& $ADODB_SESS_CONN->SelectLimit($sql,1); |
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| 396 | if ($rs && !$rs->EOF) { |
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| 397 | |
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| 398 | $dbts = reset($rs->fields); |
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| 399 | $rs->Close(); |
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| 400 | $dbt = $ADODB_SESS_CONN->UnixTimeStamp($dbts); |
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| 401 | $t = time(); |
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| 402 | |
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| 403 | if (abs($dbt - $t) >= ADODB_SESSION_SYNCH_SECS) { |
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[34] | 404 | |
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[2] | 405 | $msg = |
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[34] | 406 | __FILE__.": Server time for webserver {$_SERVER['HTTP_HOST']} not in synch with database: database=$dbt ($dbts), webserver=$t (diff=".(abs($dbt-$t)/3600)." hrs)"; |
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[2] | 407 | error_log($msg); |
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[34] | 408 | if ($ADODB_SESS_DEBUG) ADOConnection::outp(" |
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| 409 | -- $msg</p>"); |
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[2] | 410 | } |
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| 411 | } |
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| 412 | |
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| 413 | return true; |
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| 414 | } |
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| 415 | |
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| 416 | session_module_name('user'); |
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| 417 | session_set_save_handler( |
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| 418 | "adodb_sess_open", |
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| 419 | "adodb_sess_close", |
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| 420 | "adodb_sess_read", |
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| 421 | "adodb_sess_write", |
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| 422 | "adodb_sess_destroy", |
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| 423 | "adodb_sess_gc"); |
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| 424 | } |
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| 425 | |
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| 426 | /* TEST SCRIPT -- UNCOMMENT */ |
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| 427 | |
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| 428 | if (0) { |
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| 429 | |
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| 430 | session_start(); |
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[34] | 431 | $_SESSION['AVAR'] += 1; |
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| 432 | ADOConnection::outp( " |
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| 433 | -- \$_SESSION['AVAR']={$_SESSION['AVAR']}</p>",false); |
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[2] | 434 | } |
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| 435 | |
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[1057] | 436 | ?> |
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