function of the session in PHP3 (i) _php tutorial

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
#
# Feel free 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 was 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 following $sess_table variable.

Here you need to set the library name, and the table name.
However, the general recommendation is to 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)
# also not set to indicate that this cookie is valid only at the current session
# This is just like the time of the session in ASP.
# return value ....: A unique Session-id (stored as a cookie)
# ----------------------------------------------------
function Session_checkid ($min)
{
Global $sess _sid;

if (! $sess _sid) {
$sess _sid = uniqid (SC); Get a unique random number
/*
if ($min > 0) {
Setcookie ("Sess_sid", $sess _sid, Time () + ($min *60), "/", "", 0);
}
else {
Setcookie ("Sess_sid", $sess _sid, "", "/", "", 0);
}
Above is the original code, error. So 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: Converting 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 ("&", $ts);
while (list ($key, $val) = each ($vals)) {
List ($name, $wert) = Split ("=", $val);
if ($val) eval ("$ $name =" $wert ";");
}
}

# ----------------------------------------------------------
# Session_read ()-takes data from the session table and transforms it into a session array
# parameter ...: none
# return Value ...: Returns TRUE if data is read, False otherwise
#注意 ...: 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 the session array to a string
# parameter ...: array
# return value ...: array-derived string
#
# Thanks to Rasmus (this person seems to be the inventor of PHP)
# Note: Convert session array to 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 = "", $c = "")
{
while (list ($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 to the session table
# parameter.: none
# return Value ...: Returns True if the deposit is normal, otherwise 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-Clears all current session
# and delete 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

http://www.bkjia.com/PHPjc/316688.html www.bkjia.com true http://www.bkjia.com/PHPjc/316688.html techarticle Session function library: session.inc.php3 php if (!isset ($__session_inc__)) {$__session_inc__=1;//require (COOKIE.INC.PHP3); # -----------------------------------------------------------...

