<?php
if (!isset($__session_inc__)){
$__session_inc__=1;
//require("cookie.inc.php3");
# -------------------------------------------------------------------;;
# Session Management v1.0 21.6.1998;;
# (c) Wild Karl Heinz <kh.wild@wicom.at>;;
#;;
# This Include handle Session based variable handling;;
#;;
# Please feel free and use it. If you make it more functional;;
# it would be nice to send me a copy.;;
#;;
# Don’t forget - Mysql_connect !;;
#;;
# The database structure;;
# Table structure for table ’session’;;
#;;
# CREATE TABLE session (;;
# id int(11) DEFAULT ’0’ NOT NULL auto_increment,;;
# sid varchar(20) DEFAULT ’’ NOT NULL,;;
# val blob,;;
# times timestamp(14),;;
# PRIMARY KEY (id),;;
# KEY sid (sid),;;
# UNIQUE sid_2 (sid);;
# );;;
#;;
# You’ll miss here a cron job to delete the old sessions from db;;
# -------------------------------------------------------------------;;
// 请注意上面被注释掉的CREATE TABLE语句，
// 你需要在你所使用的数据库上执行这条语句，
// 表名也可以不是session，那么就需要设置下面的$sess_table变量了。
// 此处你需要设置库名，和表名。
// 不过一般建议就使用session作为表名
$sess_db = ’dbname’;;;
$sess_table = ’session’;;;
# ----------------------------------------------------;;
# Session_CheckID - 检查、设置并返回 Session-ID;;
# 参数......: cookie保存时间(以分钟计)
# 也可不设置表示这个 cookie 只在当前session 有效
# 这其实就象ASP中SESSION的时效一样。
# 返回值....: 一个唯一的Session-ID （作为cookie存储）
# ----------------------------------------------------;;
function Session_CheckID( $min );;
{
global $sess_sid;;;
if( !$sess_sid ) {;;
$sess_sid = uniqid( SC ); //取得一个唯一的随机数
/*
if( $min > 0 ) {;;
SetCookie("sess_sid", $sess_sid, time()+($min*60), "/", "", 0 );;;
};;
else {;;
SetCookie("sess_sid", $sess_sid, "", "/", "", 0 );;;
};;
上面是原先的代码，会出错。所以另外用了一个更好的函数。
函数库：cookie.inc.php3
*/
jssetcookie("sess_sid",$sess_sid,$min);
return( false );;;
};;
else {;;
return( true );;;
};;
};;
# ----------------------------------------------------------;;
# str2arr - 将字符串转换成session数组
# 参数.....: string
# 返回值...: 全局数组（其实就是session);;
#本函数用途：将字符串转换成session数组
#如"session[username]=yourid&session[userpass]=12345"
#将会被转换成下面的数组
# session[username]="yourid"
# session[userpass]="12345"
#请注意函数split(),each(),list(),eval()的用法。
# ----------------------------------------------------------;;
function str2arr( $ts );;
{;;
global $session;;;
$vals = split( "&", $ts );;;
while( list($key,$val) = each($vals) ) {;;
list( $name, $wert ) = split( "=", $val );;;
if( $val ) eval( "$$name = "$wert";" );;;
};;
};;
# ----------------------------------------------------------;;
# session_read() - 从SESSION表中取数据，转换成session数组;;
# 参数........: 无
# 返回值......: 如果读出数据，返回 true ，否则返回 false
#注意.........: 用到了str2arr()这个函数
# ----------------------------------------------------------;;
function session_read();;
{;;
# Hash array to keep session-variables;;
global $session;;;
global $sess_sid, $sess_db, $sess_table, $sess_error;;;
$sel = "Select val from $sess_table where sid = ’$sess_sid’";;;
$res = mysql_db_query( $sess_db, $sel );;;
if( mysql_numrows( $res ) ) {;;
$val = mysql_result( $res, 0, "val" );;;
str2arr( $val );;;
mysql_free_result( $res );;;
return( true );;;
};;
else {;;
return( false );;;
$sess_error = mysql_error();;;
};;
};;
# ------------------------------------------------------;;
# Split_Array() - 将session数组转换成字符串
# 参数.......: 数组
# 返回值.....: 数组转换得来的字符串;;
#;;
# Thanks to Rasmus (这人好象是PHP的发明人)
# 注意:将session数组转换成字符串
#如session[username]="yourid"
# session[userpass]="12345"
#将会被转换成"session[username]=yourid&session[userpass]=12345"
#同时该函数考虑到了数组的某个元素也是数据的情况
#这个函数被设计成一个递归函数
# ------------------------------------------------------;;
function Split_Array( $arr, $a = "", $b = "", $c = "" );;
{;;
while( list( $key, $val ) = each( $arr ) ) {;;
if( is_array( $val ) ) {;;
$ts .= Split_Array( $arr[ $key ],;;
( strlen( $a ) ? $a : $key ),;;
( strlen( $b ) ? $b : ( strlen( $a ) ? $key : "" ) ),;;
( strlen( $c ) ? $c : ( strlen( $b ) ? $key : "" ) ) );;;
};;
else {;;
$ts .= "session";;;
$ts .= $a ? "[$a]" : "";;;
$ts .= $b ? "[$b]" : "";;;
$ts .= $c ? "[$c]" : "";;;
$ts .= "[$key]=$val&";;;
};;
};;
return( $ts );;;
};;
# ---------------------------------------------------;;
# session_write - 将session数组转换成字符串，再存到session表中;;
# 参数.: 无
# 返回值...: 如果存入正常返回 true ，否则返回 false
# ---------------------------------------------------;;
function session_write();;
{;;
# Hash array to keep session-variables;;
global $session;;;
global $sess_sid, $sess_db, $sess_table;;;
global $sess_error;;;
# if you like to delete a session-cookie;;
# you must check it before writting the session;;
# array;;
if( !$sess_sid ) { session_checkid( 0 ); };;
$ts = Split_Array( $session );;;
if( $ts > "" ) { $ts = substr( $ts, 0, strlen( $ts ) - 1 ); };;
$res = mysql_db_query( $sess_db, "Select * from session where sid = ’$sess_s’");;;
if( mysql_numrows( $res ) == 0 ) {;;
$sel = "Insert into $sess_table ( id, sid, val, times ) ";;;
$sel .= "values( 0, ’$sess_sid’, ’$ts’, NULL )";;;
};;
else {;;
$sel = "Update $sess_table set val = ’$ts’, ";;;
$sel .= "times = NULL where sid = ’$sess_sid’";;;
};;
if( !mysql_db_query( $sess_db, $sel ) ) {;;
$sess_error = mysql_error();;;
return( false );;;
};;
else { return( true ); };;
};;
# ---------------------------------------------;;
# session_del - 清除当前所有的session
# 并删除session表中和当前session有关的记录;;
# 参数.....: 一个随机的session id;;
# 返回值...: 无
# ---------------------------------------------;;
function session_del();;
{;;
global $session, $sess_db, $sess_table, $sess_sid;;;
$sel = "Delete from $sess_table where sid = ’$sess_sid’";;;
if( !mysql_db_query( $sess_db, $sel ) ) {;;
$sess_error = mysql_error();
}
$sess_sid = ’’;
}
}
?>;;;
原作者：不详;;
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