Implement session function in PHP3 (one, Session function library: SESSION.INC.PHP3) (translate)

session| function <?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 and use it. If You do it more functional
# It would is nice to send me a copy.
#
# Don ' t Forget-mysql_connect!
#
# The database structure
# Table structure for table ' session '
#
# CREATE TABLE Session (
# ID Int (one) DEFAULT ' 0 ' not NULL auto_increment,
# SID varchar 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
# -------------------------------------------------------------------

Note the CREATE TABLE statement that is commented out above.
You need to execute this statement on the database you are using,
The table name can also not be a session, then you need to set the following $sess_table variable.

Here you need to set the library name, and the table name.
However, it is generally recommended that you use the session as the table name
$sess _db = ' dbname ';
$sess _table = ' Session ';

# ----------------------------------------------------
# Session_checkid-Check, set, and return Session-id
# Parameters ...: Cookie save time (in minutes)
# can also not be set to indicate that this cookie is valid only in the current session
# This is actually like the duration of the session in ASP.
# return value ...: a unique session-id (stored as cookies)
# ----------------------------------------------------
function Session_checkid ($min)
{
Global $sess _sid;

if (! $sess _sid) {
$sess _sid = uniqid (SC); To get a unique random number
/*
if ($min > 0) {
Setcookie ("Sess_sid", $sess _sid, Time () + ($min *60), "/", "", 0);
}
else {
Setcookie ("Sess_sid", $sess _sid, "", "/", "", 0);
}
This is the original code, there will be an error. So in addition, a better function is used.
function library: cookie.inc.php3
*/
Jssetcookie ("Sess_sid", $sess _sid, $min);
return (false);
}
else {
return (true);
}
}

# ----------------------------------------------------------
# Str2arr-Converts a string into a session array
# parameters ...: string
# return value ...: Global array (in fact, session)
#本函数用途: Converts a string into a session array
#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 () usage.
# ----------------------------------------------------------
function Str2arr ($ts)
{
Global $session;

$vals = Split ("&", $ts);
while (the list ($key, $val) = each ($vals)) {
List ($name, $wert) = Split ("=", $val);
if ($val) eval ("\$ $name = \" $wert \; ");
}
}

# ----------------------------------------------------------
# Session_read ()-takes data from the session table and converts it into a session array
# parameters ...: None
# return value ...: If read out data, return True, otherwise return false
#注意 ...: The function of Str2arr () is used.
# ----------------------------------------------------------
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 ()-Converts the session array into a string
# Parameters ...: array
# return value ...: array-converted String
#
# to Rasmus (this guy seems to be the inventor of PHP)
# Note: Converts the session array into a string
#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 = "", $c = "")
{
while (the list ($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-Converts the session array to a string and then saves it to the session table
# parameters.: None
# return Value ...: Returns True if the deposit is normal, or 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
# 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 (IDs, 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-Clears all current sessions
# and delete records in the session table that are related to the current session
# parameters ...: a random session ID
# return value ...: none
# ---------------------------------------------
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 = ';
}
}
?>