Implement the SESSION function in PHP3

SESSION function library: session. inc. php3? Phpif (! Isset ($ __session_inc _) {$ __session_inc _ 1; // require (cookie. inc. php3); # reset SESSION function library: session. inc. php3

If (! Isset ($ __session_inc __)){
$ __Session_inc __= 1;
// Require ("cookie. inc. php3 ");
#-------------------------------------------------------------------
# Session Management v1.0 21.6.1998
# (C) Wild Karl Heinz
#
# This Include handle Session based variable handling
#
# Please feel free and use it. If you make it more functional
# It wocould 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
#-------------------------------------------------------------------

// Note the 'create table' statement commented out above,
// You need to execute this statement on the database you are using,
// The table name may not be a session, so you need to set the $ sess_table variable below.

// Set the database name and table name here.
// However, we recommend that you use session as the table name.
$ Sess_db = 'dbname ';
$ Sess_table = 'session ';

#----------------------------------------------------
# Session_CheckID-check, set, and return Session-ID
# Parameter ......: cookie retention time (in minutes)
# This cookie is valid only for the current session.
# This is actually the same as the SESSION validity period in ASP.
# Return value...: a unique Session-ID (stored as a cookie)
#----------------------------------------------------
Function Session_CheckID ($ min)
{
Global $ sess_sid;

If (! $ Sess_sid ){
$ Sess_sid = uniqid (SC); // Obtain a unique random number.
/*
If ($ min> 0 ){
SetCookie ("sess_sid", $ sess_sid, time () ($ min * 60), "/", "", 0 );
}
Else {
SetCookie ("sess_sid", $ sess_sid, "", "/", "", 0 );
}
The above is the original code, which may cause errors. Therefore, 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 to a session array
# Parameter ......: string
# Return value...: Global Array (actually session)
# Purpose of this function: convert a string to a session array
# For example, "session [username] = yourid & session [userpass] = 12345"
# Will be converted to the following array
# Session [username] = "yourid"
# Session [userpass] = "12345"
# Note the usage of functions split (), each (), list (), and eval.
#----------------------------------------------------------
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 ()-fetch data from the SESSION table and convert it to the session array
# Parameter ......: None
# Return value ......: if data is read, true is returned; otherwise, false is returned.
# Note ......: the str2arr () function 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 a session array to a string
# Parameter ......: Array
# Return value...: string obtained from array conversion
#
# Thanks to Rasmus (this person seems to be the inventor of PHP)
# Note: convert the session array to a string
# Session [username] = "yourid"
# Session [userpass] = "12345"
# It will be converted to "session [username] = yourid & session [userpass] = 12345"
# At the same time, this function considers that an element of the array is also data.
# This function is designed as a recursive function.
#------------------------------------------------------
Function Split_Array ($ arr, $ a = "", $ B = "", $ c = "")
{
While (list ($ key, $ val) = each ($ arr )){
If (is_array ($ val )){
$ Ts. = Split_Array ($ arr [$ key],
(Strlen ($ )? $ A: $ key ),
(Strlen ($ B )? $ B: (strlen ($ )? $ Key :"")),
(Strlen ($ c )? $ C: (strlen ($ B )? $ Key :"")));
}
Else {
$ Ts. = "session ";
$ Ts. = $? "[$ A]": "";
$ Ts. = $ B? "[$ B]": "";
$ Ts. = $ c? "[$ C]": "";
$ Ts. = "[$ key] = $ val &";
}
}
Return ($ ts );
}

#---------------------------------------------------
# Session_write-convert the session array to a string and store it in the session table.
# Parameter.: None
# Return value...: true is returned if the data is stored normally; otherwise, false is returned.
#---------------------------------------------------
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-clear all current sessions
# Delete the records related to the current session in the session table
# Parameter ......: 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 = '';
}
}
?>

Original Author: unknown