session慡嫵掱(擇)

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session慡嫵掱(擇)

擇丄php3,4拞session揑实现

嵼php3拞惀杤桳session这种东东揑丆扐変们枖廀梫丆渻么办呢丠别媫丆桳渒懡恖懼你橍椆这嵄丆这懘拞嵟桳柤揑梫嶼phplib椆丅你壜埲嫀崙奜壓载丆壜埲忋崙撪戝晹暘php鈰揰壓载丅変们梫橍揑戞堦審帠惀让phplib榓php3结崌嵼堦婲巊泙擻岺嶌丅为椆擻实现这曽柺揑岟擻丆変们廀梫愭埨憰phplib丅骖拝変棃橍丆渒梕堈揑(埲壓曽朄嵼win2000+php3.0.16+apache1.3.12+phplib7.2c+mysql3.23.21 for win32 忋捠过)phplib嵟婎杮揑岟擻曪妵梡户认证丆Session娗棟丆权尷媦悢悩库揑拪徾壔丅

渻样巊梡phplib棃实现session岟擻呢?

堦丄庱愭你彨phplib夝开丆棦柺桳堦槩栚录嫨"php",彨这槩栚录崏贝摓apache揑埨憰栚录壓丅埲笔幰揑婘婍为椺:変揑apache埨憰嵼d:/apache栚录壓,変彨忋柺揑"php"栚录崏贝摓d:a/pache,涹彨phplib壓揑pages 栚录壓揑暥審榓栚录堦婲崏贝摓 d:/apache/htdocs壓丆拲堄晄带栚录杮恎丅phplib揑类库廀梫崻悩宯统进峴弶巒壔丆你壜埲廋夵local.inc暥審丆懘拞曪娷拝堦嵄婎杮嶲悢丆你壜埲崻悩帺屓婘婍揑实际忣檝棃进峴廋夵丅彨d:/apache/php/prepend.php3暥審拞揑堦抜掱彉夵为擛壓样巕丗

if (!isset($_PHPLIB) or !is_array($_PHPLIB)) {
$_PHPLIB["libdir"] = "d:/apache/php/"; //这橷夵为你曻phplib壓php栚录揑楬宎
}

慠岪彨d:/apache/php/local.inc暥審夵擛壓:

class DB_Example extends DB_Sql {
var $Host = "localhost";//你揑mysql悢悩库強嵼庡婘柤
var $Database = "test";//悢悩库柤
var $User = "root";//悢悩库梡户柤
var $Password = "";//悢悩库梡户岥椷
}

嵟岪堦步执峴夝开揑phplib栚录拞揑stuff栚录壓揑create_database.mysql暥審,惗惉弶巒昞丅変们说柧堦壓phplib揑岺嶌尨棟丆每堦槩巊梡phplib揑页柺庱愭昁须壜埲漄摓运峴phplib強昁须类库暥審丆変们壜埲嵼php3.ini拞设抲auto_prepend变検棃巟帩丆phplib暘发曪拞曪娷堦槩prepend.php3暥審丆彨auto_prepend巜掕"d:/apache/php/prepend.php3"(带堷崋)岪丆奺页柺廇夛帺动曪娷phplib类库丆変们还壜埲彨phplib类库強嵼栚录壛进include变検拞丆埲曋壜埲漄摓这嵄暥審丆摉慠丆嵟苯揑办朄廇惀巜掕phplib揑绝对楬宎丆这壜晄惀槩岲庡堄,壜堏怉惈懢嵎両

戞擇步丆每堦槩巊梡phplib揑页柺拞丆你昁须庱愭调梡page_open敓悢进峴弶巒壔丅这夛崘诉phplib丆你现嵼埥彨棃夛梡摓忬态曐懚丅堦槩揟宆揑
page_open椺巕擛壓丗

<?php
page_open(array("sess" => "Example_Session"));
?>

悢组变検(sess)梡棃弶巒壔堦嵄忬态曐懚对徾丆拲堄丗昁须巊梡phplib撪抲柤(sess)丆这嵄撪抲柤惀你嵼local.ini拞強掕义揑丆page_open敓悢昁须嵼页柺撪梕输弌摓浏览婍擵慜旐调梡丅php3媟杮嵟岪应埲page_close()结懇丆这彨夛彨桳关忬态悢悩幨夞摓悢悩库拞丆擛壥你朰椆揑话丆结壥你应该擻憐摓,欫欫丆你揑变検慡丢椆,壜晄梫夦変杤崘诉你...

場为phplib巊梡椆Cookies棃曐懚忬态怣懅丆強埲page_open()敓悢昁须嵼页柺撪梕输弌摓浏览婍擵慜旐调梡丆这棦揑页柺撪梕壜埲惀擟壗HTML怣懅埥幰嬻峴丆擛壥你发现椆错误"Oops - SetCookie called after header has been sent"丆这昞柧嵼page_open()擵慜岦浏览婍输弌椆嵄廦么丆你梫摿别棷堄嬻峴丆場为旕忢难漄摓丆揟宆揑错误惀嵼<? 榓 ? >标记擵间输弌椆嬻峴丆你应检查嵼local.inc榓prepend.php3暥審拞惀斲曪娷椆嬻峴丆这栫惀堦槩旕忢梕堈弌错揑抧曽丅为椆减彮弌错揑壜擻,変们壜埲这样书幨弶巒壔掱彉:
<?
page_open(array("sess" => "Example_Session"));
?>
<html>
.....
</html>

戞嶰步丆嬶懱巊梡丅
摉堦槩梡户访问椆该悚鈰岪丆悘懄梡户揑session廇开巒椆丆擛壥梡户揑浏览婍巟帩cookie揑话丆彨夛寶棫堦槩session揑id曻擖cookie丆这槩桞堦揑ID惀桼PHP3悘婘惗惉丆慠岪枖梡悘婘种巕帤孁进峴md5壛枾过椆揑丆这棦揑cookie应该嫨橍session cookie丆場为这槩cookie惀晄夛幨摓梡户峝盘棦嫀揑丆摉堦槩session婜结懇揑时岓丆该cookie栫旐姰结椆丅擛壥梡户浏览婍晄巟帩cookie揑话丆撨么该session揑id彨夛曻擖url链拞丆場为惀壛枾过揑丆強埲愞庢椆栫杤梡丅session ID懚曻拝梡户揑桳关怣懅丆擛梡户涍认证丄认证摓婜时间丄梡户权尷丆榓懘懠堦嵄你壜擻廀梫揑怣懅丆曽曋変们庢梡丅Session懘实廇惀梡户堦師夛话揑过掱丅Session涹晄惀仅仅梡棃骖鏗梡户揑拲檈丆实际忋丆泙还壜埲桳懘泙揑巊梡场崌丆你壜埲梡泙棃懚储擟壗你憐梫懚贮揑怣懅丆这嵄怣懅壜埲嵼梡户悘岪访问揑页柺拞攈忋梡场丆摉慠慜採惀撨嵄页柺梫巊梡PHPLIB丅曽朄渒简单丆拲檈堦槩变検岪懄壜嵼悘岪揑页柺拞巊梡泙丆捈帄session结懇丅曽朄丗
<?php $sess->register( "variable_name"); ?>

拲堄丆这棦揑variable_name晄惀变検值丆帶惀变検柤丆壜埲愭巜掕变検柤丆悘岪嵞赋值丅你嵼朸槩页柺拞壜埲夵变变検揑值丆悘岪揑页柺访问该变検夛摼摓夵变岪揑值丅变検揑类宆惀懡样揑丆壜埲惀堦槩帤孁丆堦槩悢帤丆堦槩悢组丅举椺棃说柧丗

戞堦页:
<?php
page_open(array("sess" => "Example_Session"));
$sess->register( "first"); //拲堄变検柤慜晄廀梫壛$
if (iset($firstname)) {
$first = $firstname;
}
.....
page_close();
?>

戞擇页:
<?php
page_open();//开巒session

echo $first;//娕娕澚壥

page_close();//曐懚忬态怣懅
?>

拲檈姰堦槩变検丆摉页柺嵟岪调梡page_close()敓悢岪丆奺槩session变検夛旐幨夞摓悢悩库拞丅擛壥你朰记调梡page_close()敓悢揑话丆变検廇晄夛旐幨夞悢悩库丆彨弌现晄壜预抦揑岪壥丅摉变検旐巊梡姰毕丆你晄嵞廀梫梡摓时丆壜埲调梡埲壓敓悢彨变検删彍丗

<?php
page_open(array("sess" => "Example_Session"));
...
$sess->unregister( "variable_name");
...
page_close();
?>

PHPLIB 7.0拞丆巊梡椆堦种懚储结构丆泙堯许你懚储session悢悩摓悢悩库拞丄嫟嫕撪懚拞埥幰LDAP拞丅PHPLIB巊梡椆悢悩库类丆这巊摼你桳椆峏懡揑选择,你壜埲选梡oracle8,mysql,postgresql摍摍悢悩库棃曐懚忬态怣懅丅

关槹phplib拞揑懘泙岟擻埲媦桳关session揑懘泙敓悢揑巊梡丆你壜埲嶲娕泙带揑庤檈,埥忋泙揑悚鈰娕嵼线暥瀮丅泙揑榁壠嵼http://phplib.netuse.de/index.php3 丅php4揑session实现戝搒樃phplib妛棃揑丆泙栫柘cookies曐懚session id,梡暥審宯统曐懚变検(嘁认忣檝壓)丅場崯丆泙揑session变検晄擻曐懚对徾(帠实忋擻曐懚对徾撪梕丆扐杤桳堄义丆場为泙惀曐懚嵼帴盘忋揑丆晄惀妶揑对徾丆廩懘検栫廇惀对徾洐懱丅)晄过这揰揑尷惂晄惀懢戝丆変们嵼戝晹暘忣檝壓搒扅廀梫曐懚变検廇峴椆丅摉慠你栫壜埲彨session曐懚嵼悢悩库拞,壓堦彫节拞変们夛讲摓渻样彨session曐懚嵼悢悩库拞丅嵼php4拞桼槹斾php3懡椆session巟帩丆強埲嵼php.ini暥審拞栫懡椆session攝抲选项丅壓柺変们棃娕娕奺项揑嶌梡梌堄义:

[Session]
session.save_handler = files ; handler used to store/retrieve data(梡廦么曐懚session变検,嘁认忣檝壓梡暥審)
session.save_path = c:/temp ; argument passed to save_handler(曐懚session变検揑栚录丆嵼linux/unix壓为/tmp,嵼win壓设为你揑栚录)
; in the case of files, this is the
; path where data files are stored
session.use_cookies = 1 ; whether to use cookies(惀斲巊梡cookies,摉慠丆嵼win壓别澷选择)
session.name = PHPSESSID
; name of the session(嘁认session巊梡揑cookies柤,寶议晄梫夵动)
; is used as cookie name
session.auto_start = 0 ; initialize session on request startup(惀斲帺动启梡session,摉为1时丆嵼每页拞廇壜埲晄昁调梡session_start()敓悢椆)
session.cookie_lifetime = 0 ; lifetime in seconds of cookie(设掕 cookie 憲摓浏览婍岪揑曐懚时间丆单埵为昩丅銥徣值为 0丆昞帵捈摓浏览婍关闭丅)
; or if 0, until browser is restarted
session.cookie_path = / ; the path the cookie is valid for(cookie)(cookies桳澚楬宎)
session.cookie_domain = ; the domain the cookie is valid for(cookies桳澚堟柤)
session.serialize_handler = php ; handler used to serialize data(掕义彉楍壔悢悩揑标识丆杮岟擻扅桳 WDDX 柾块埥 PHP 撪晹巊梡丅銥徣值为 php)
; php is the standard serializer of PHP
session.gc_probability = 1 ; percentual probability that the (设掕每師临时暥審开巒处棟 (gc, garbage collection) 处棟奣棪丅銥徣值为 1丅 )
; 'garbage collection' process is started
; on every session initialization
session.gc_maxlifetime = 1440 ; after this number of seconds, stored(设掕曐懚session揑临时暥審旐惔彍慜揑懚妶昩悢)
; data will be seen as 'garbage' and
; cleaned up by the gc process
session.referer_check = ; check HTTP Referer to invalidate (檙掕嶲徠摓媞户抂揑Session 戙码惀斲梫删彍丅桳时嵼埨慡埥懘泙峫虑时丆夛设掕晄删彍丅銥徣值为 0丅)
; externally stored URLs containing ids
session.entropy_length = 0 ; how many bytes to read from the file(设掕 session 樃崅熵值资尮读庢揑埵悢丅銥徣值为 0.)
session.entropy_file = ; specified here to create the session id(设掕 session 戙码寶棫时丆巊梡奜晹崅熵值资尮埥暥審棃寶棫丆椺擛 UNIX 宯统忋揑 /dev/random 埥 /dev/urandom丅 )
; session.entropy_length = 16
; session.entropy_file = /dev/urandom
session.cache_limiter = nocache ; set to { nocache,private,public } to (设掕session缓檛尷惂)
; determine HTTP caching aspects
session.cache_expire = 180 ; document expires after n minutes(暥瀮桳澚婜,单埵为暘钟)

嵼windows暯戜壓丆php4.01pl2埲慜揑斉杮夛弌现设抲session.save_path 岪弌错揑忣檝丆这惀php揑堦槩bug,嵼php4.01pl2媦埲岪涍经廋惓椆丅擛壥你梡埲慜揑斉杮丆你壜埲彨session.save_path设为"./",埥设为"/temp",涹嵼你曻抲php媟杮揑摉慜盘崻栚录壓寶堦槩柤为temp揑栚录懄壜(変揑php媟杮曻嵼d:apachehtdocs壓丆则変嵼d:盘崻栚录壓寶堦柤为temp揑栚录)丅
嵼php4拞桳关session揑敓悢庡梫桳埲壓这嵄丗

session_start: 弶巒壔session,廀梫梡session揑每堦槩页柺嵟开巒处调梡丅
session_destroy: 结懇 session,嵼廀梫结懇session处调丅
session_name: 懚庢栚慜 session 柤徧丅
session_module_name: 懚庢栚慜 session 柾块丅
session_save_path: 懚庢栚慜 session 楬宎丅
session_id: 懚庢栚慜 session id崋丅
session_register: 拲檈怴揑session变検丅
session_unregister: 删彍涍拲檈session变検丅
session_is_registered: 检查session变検惀斲拲檈丅
session_decode: Session 悢悩夝码丅
session_encode: Session 悢悩壛枾丅

捠忢忣檝壓変们扅廀梫调梡嶰槩敓悢懄壜丅
懄sesssion_start()丄session_register()丄session_is_registered()丅
嵼廀梫梡摓session揑每堦页揑嵟开巒处调梡session_start()敓悢丆
堦槩揟宆揑巊梡session揑页柺擛壓丗
<?session_start()?>
<html>
....
<body>
<?
$var="hello";
session_register("var");//拲檈$var变検丆拲堄杤桳$晞崋

if(session_is_registered("var"))//检查变検惀斲拲檈
echo "haha,拲檈椆!";
else
echo "sorry,还杤桳拲檈!";

?>
</body>
</html>

php4拞session处棟揑掕惂

変们廀梫扩廩6槩敓悢丆摉慠这嵄敓悢晄廀你嫀调梡丆对変们棃说惀摟柧揑丅

这檣槩敓悢惀:
sess_open($sess_path, $session_name);

这槩敓悢旐session处棟掱彉调梡棃嶌弶巒壔岺嶌丅廀梫传给泙揑两槩嶲悢惀$sess_path,泙对应你揑php.ini暥審拞揑session.save_path选项;$session_name,泙对应php.ini拞揑session.name 选项丅泙们嬶懱渻样岺嶌,请娕壓柺揑椺巕丅

sess_close();

这槩敓悢嵼页柺结懇执峴涹妿session处棟掱彉廀梫关闭时旐调梡丅(拲堄丆晄梫榓sess_destory崿熇椆,泙惀梡棃结懇session揑)

sess_read($key);

这槩敓悢嵼session处棟掱彉读庢巜掕session键值($key)时丅
这槩敓悢检嶕涹曉夞标识为$key揑session悢悩.(拲堄丗你晄梡扴怱渻样彉楍壔榓斀彉楍壔悢悩,擛壥你晄抦摴这惀廦么堄巚丆晄梫扴怱泙)

译幰拲丗彉楍壔惀彨变検埥对徾嵼掱彉结懇埥廀梫时曐懚嵼暥審拞丆嵼壓師掱彉运峴埥廀梫时嵞
调擖撪懚揑媄术,桳别槹扅曐懚悢悩揑曽朄丅

sess_write($key, $val);

这槩敓悢悩嵼session处棟掱彉廀梫彨悢悩曐懚时调梡,这种忣檝经忢嵼你揑掱彉结懇时发惗丅泙负责彨悢悩曐懚嵼壓師擻梡sess_read($key)敓悢检嶕揑抧曽丅

sess_destroy($key);

这槩敓悢嵼廀梫徚毁session时丅泙负责删彍session涹妿惔彍环嫬丅

sess_gc($maxlifetime);
这槩敓悢负责惔棟彡曅丅嵼这种忣檝壓丆泙负责删彍过时揑session悢悩丅session处棟掱彉夛嬼尔调梡泙们丅

现嵼変们涍经惔慯椆変们採嫙揑敓悢丅

掕惂掱彉壜埲梡mysql悢悩库埥DBM暥審曐懚session悢悩丅庢檙槹你揑廀梫丅
擛壥你檙掕巊梡mysql嶌巟帩丆撨廀梫嶌埲壓岺嶌:

庱愭変们嵼mysql拞创寶堦槩sessions悢悩库丆涹妿创寶堦槩sessions昞丅愭运峴你揑mysql媞户抂涹妿执峴壓柺揑柦椷丗
mysql> CREATE DATABASE sessions;

mysql> GRANT select, insert, update, dele ON sessions.* TO phpsession@localhost
-> IDENTIFIED BY 'phpsession';

mysql> CREATE TABLE sessions (
-> sesskey char(32) not null,
-> expiry int(11) unsigned not null,
-> value text not null,
-> PRIMARY KEY (sesskey)
-> );

壓堦步,廋夵session_mysql.php暥審揑$SESS_DB* 变検巊懘旵攝你婘婍忋揑悢悩库设抲丅

(渒書焆丆桼槹斉权尨場丆変晄擻攃埲壓戙码拞揑塸暥嫀漿丆扅岲壛嵄拲释椆
==================================================================================
<?
/* ------------------------------------------------------------------------
* session_mysql.php
* ------------------------------------------------------------------------
* PHP4 MySQL Session Handler
* Version 1.00
* by Ying Zhang (ying@zippydesign.com)
* Last Modified: May 21 2000
*
* ------------------------------------------------------------------------
* TERMS OF USAGE:
* ------------------------------------------------------------------------
* You are free to use this library in any way you want, no warranties are
* expressed or implied. This works for me, but I don't guarantee that it
* works for you, USE AT YOUR OWN RISK.
*
* While not required to do so, I would appreciate it if you would retain
* this header information. If you make any modifications or improvements,
* please send them via email to Ying Zhang <ying@zippydesign.com>.
*
* ------------------------------------------------------------------------
* DESCRIPTION:
* ------------------------------------------------------------------------
* This library tells the PHP4 session handler to write to a MySQL database
* instead of creating individual files for each session.
*
* Create a new database in MySQL called "sessions" like so:
*
* CREATE TABLE sessions (
* sesskey char(32) not null,
* expiry int(11) unsigned not null,
* value text not null,
* PRIMARY KEY (sesskey)
* );
*
* ------------------------------------------------------------------------
* INSTALLATION:
* ------------------------------------------------------------------------
* Make sure you have MySQL support compiled into PHP4. Then copy this
* script to a directory that is accessible by the rest of your PHP
* scripts.
* 确怣你揑php4桳mysql巟帩丆慠岪攃这槩媟杮崏贝摓榓你揑php媟杮桳关揑栚录丅
* ------------------------------------------------------------------------
* USAGE:乮巊梡曽朄乯
* ------------------------------------------------------------------------
* Include this file in your scripts before you call session_start(), you
* don't have to do anything special after that.
* 曪娷这槩暥審摓你梫巊梡session揑暥審拞丆昁须嵼调梡session_start()擵慜丆斲则,
* 夛渒嶴揑丆晄梫夦変杤崘诉你丅这样廇晄廀梫嵞橍廦么岺嶌椆,还榓你埲慜梡session揑曽朄堦样丅
*/

$SESS_DBHOST = "localhost"; /* database server hostname */
$SESS_DBNAME = "sessions"; /* database name */
$SESS_DBUSER = "phpsession"; /* database user */
$SESS_DBPASS = "phpsession"; /* database password */

$SESS_DBH = "";
$SESS_LIFE = get_cfg_var("session.gc_maxlifetime");

function sess_open($save_path, $session_name) {
global $SESS_DBHOST, $SESS_DBNAME, $SESS_DBUSER, $SESS_DBPASS, $SESS_DBH;

if (! $SESS_DBH = mysql_pconnect($SESS_DBHOST, $SESS_DBUSER, $SESS_DBPASS)) {
echo "<li>Can't connect to $SESS_DBHOST as $SESS_DBUSER";
echo "<li>MySQL Error: ", mysql_error();
die;
}

if (! mysql_select_db($SESS_DBNAME, $SESS_DBH)) {
echo "<li>Unable to select database $SESS_DBNAME";
die;
}

return true;
}

function sess_close() {
return true;
}

function sess_read($key) {
global $SESS_DBH, $SESS_LIFE;

$qry = "SELECT value FROM sessions WHERE sesskey = '$key' AND expiry > " . time();
$qid = mysql_query($qry, $SESS_DBH);

if (list($value) = mysql_fetch_row($qid)) {
return $value;
}

return false;
}

function sess_write($key, $val) {
global $SESS_DBH, $SESS_LIFE;

$expiry = time() + $SESS_LIFE;
$value = addslashes($val);

$qry = "INSERT INTO sessions VALUES ('$key', $expiry, '$value')";
$qid = mysql_query($qry, $SESS_DBH);

if (! $qid) {
$qry = "UPDATE sessions SET expiry = $expiry, value = '$value' WHERE sesskey
= '$key' AND expiry > " . time();
$qid = mysql_query($qry, $SESS_DBH);
}

return $qid;
}

function sess_destroy($key) {
global $SESS_DBH;

$qry = "DELETE FROM sessions WHERE sesskey = '$key'";
$qid = mysql_query($qry, $SESS_DBH);

return $qid;
}

function sess_gc($maxlifetime) {
global $SESS_DBH;

$qry = "DELETE FROM sessions WHERE expiry < " . time();
$qid = mysql_query($qry, $SESS_DBH);

return mysql_affected_rows($SESS_DBH);
}

session_set_save_handler(
"sess_open",
"sess_close",
"sess_read",
"sess_write",
"sess_destroy",
"sess_gc");
?>
=================================================================
掕惂巊梡dbm暥審时揑愙岥
=================================================================
<?
/* ------------------------------------------------------------------------
* session_dbm.php
* ------------------------------------------------------------------------
* PHP4 DBM Session Handler
* Version 1.00
* by Ying Zhang (ying@zippydesign.com)
* Last Modified: May 21 2000
*
* ------------------------------------------------------------------------
* TERMS OF USAGE:
* ------------------------------------------------------------------------
* You are free to use this library in any way you want, no warranties are
* expressed or implied. This works for me, but I don't guarantee that it
* works for you, USE AT YOUR OWN RISK.
*
* While not required to do so, I would appreciate it if you would retain
* this header information. If you make any modifications or improvements,
* please send them via email to Ying Zhang <ying@zippydesign.com>.
*
* ------------------------------------------------------------------------
* DESCRIPTION:
* ------------------------------------------------------------------------
* This library tells the PHP4 session handler to write to a DBM file
* instead of creating individual files for each session.
*
* ------------------------------------------------------------------------
* INSTALLATION:
* ------------------------------------------------------------------------
* Make sure you have DBM support compiled into PHP4. Then copy this
* script to a directory that is accessible by the rest of your PHP
* scripts.
* 确怣你揑php4桳DBM巟帩丅崏贝这槩暥審嵼你揑php媟杮栚录丅
* ------------------------------------------------------------------------
* USAGE:
* ------------------------------------------------------------------------
* Include this file in your scripts before you call session_start(), you
* don't have to do anything special after that.
* 嵼调梡session_start()擵慜请曪娷这槩暥審丅擵岪廇晄廀梫嶌廦么岺嶌椆丅
*/

$SESS_DBM = "";
$SESS_LIFE = get_cfg_var("session.gc_maxlifetime");

function sess_open($save_path, $session_name) {
global $SESS_DBM;

$SESS_DBM = dbmopen("$save_path/$session_name", "c");
return ($SESS_DBM);
}

function sess_close() {
global $SESS_DBM;

dbmclose($SESS_DBM);
return true;
}

function sess_read($key) {
global $SESS_DBM, $SESS_LIFE;

$var = "";
if ($tmp = dbmfetch($SESS_DBM, $key)) {
$expires_at = substr($tmp, 0, strpos($tmp, "劆"));

if ($expires_at > time()) {
$var = substr($tmp, strpos($tmp, "劆") + 1);
}
}

return $var;
}

function sess_write($key, $val) {
global $SESS_DBM, $SESS_LIFE;

dbmreplace($SESS_DBM, $key, time() + $SESS_LIFE . "劆" . $val);
return true;
}

function sess_destroy($key) {
global $SESS_DBM;

dbmdele($SESS_DBM, $key);
return true;
}

function sess_gc($maxlifetime) {
global $SESS_DBM;

$now = time();
$key = dbmfirstkey($SESS_DBM);
while ($key) {
if ($tmp = dbmfetch($SESS_DBM, $key)) {
$expires_at = substr($tmp, 0, strpos($tmp, "劆"));
if ($now > $expires_at) {
sess_destroy($key);
}
}

$key = dbmnextkey($SESS_DBM, $key);
}
}

session_set_save_handler(
"sess_open",
"sess_close",
"sess_read",
"sess_write",
"sess_destroy",
"sess_gc");
?>

=================================================================
嬶懱渻么梡廇晄梡懡说椆丆場为这嵄敓悢搒惀php堷调梡揑丆梌変们澷关揑丅変们扅廀徠忋弎攝
抲岪廇峴椆丆你梡揑还惀埲慜揑session敓悢丅
娕娕壓柺揑戙码廇抦摴椆丗乯

session掕惂揑测试戙码
==================================================================
<?
/* ------------------------------------------------------------------------
* test.php
* ------------------------------------------------------------------------
* PHP4 Customer Session Handler Test Script
* Version 1.00
* by Ying Zhang (ying@zippydesign.com)
* Last Modified: May 21 2000
*/

/* default to DBM handler */
if (! isset($handler)) {
$handler = "dbm";
}

/* default action is increment */
if (! isset($action)) {
$action = "increment";
}

/* load up the appropriate session handling script, depending on the handler */
if ($handler == "dbm") {
include("session_dbm.php");

} elseif ($handler == "mysql") {
include("session_mysql.php");

} else {
echo "<li>Unrecognized handler ($handler)";
die;
}

/* start the session and register a simple counter */
session_start();
session_register("count");

/* figure out what we should do, depending on the action */
switch ($action) {
case "increment" :
$count = isset($count) ? $count + 1 : 0;
break;

case "destroy" :
session_destroy();
break;

case "gc" :
$maxlife = get_cfg_var("session.gc_maxlifetime");
sess_gc($maxlife);
break;

default:
echo "<li>Unknown action ($action)";
break;
}
?>

<h1>Session Test Script</h1>
<ul>
<li>Handler: <b><?=$handler?></b>
<li>Action: <b><?=$action?></b>
<li>Count: <b><?=$count?></b>
</ul>

<hr size=1>
<form>
<table>
<tr>
<td>Handler:</td>
<td>
<select name="handler">
<option value="dbm">DBM</option>
<option value="mysql">MySQL</option>
</select>
</td>
</tr>
<tr>
<td>Action:</td>
<td>
<select name="action">
<option value="increment">Increment</option>
<option value="destroy">Session Destroy</option>
<option value="gc">Force Garbage Collection</option>
</select>
</td>
</tr>
<tr>
<td></td>
<td><br><input type="submit"></td>
</tr>
</table>
</form>

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