Make a PHP session code
session_start
int session_start(void)
Initializes a session.
Returns:
Always returns TRUE
Description:
Initializes a session. If a session ID is sent as a
GET or in a cookie and is a valid session identifier, the session is
resumed.
Version:
Existing since version 4.0
Example:
Start a session
session_start();
if (!$counter) session_register("counter");
echo $counter;
$counter++;
<?php
// include URL utils library
require_once ‘include/url_utils.inc.php’;
// load configuration script
require_once ‘include/config.inc.php’;
// start PHP session
session_start();
// redirect affiliate links
if (isset($_REQUEST[‘aff_id’]))
{
// save the affiliate ID
$_SESSION[‘aff_id’] = $_REQUEST[‘aff_id’];
// obtain the URL with no affiliate ID
$clean_url = SITE_DOMAIN . remove_query_param($_SERVER[‘REQUEST_URI’], ‘aff_id’);
// 301 redirect to the new URL
header(‘HTTP/1.1 301 Moved Permanently’);
header(‘Location: ‘ . $clean_url);
}
// display affiliate details
echo ‘You got here through affiliate: ‘;
if (!isset($_SESSION[‘aff_id’]))
{
echo ‘(no affiliate)‘;
}
else
{
echo $_SESSION[‘aff_id’];
}
?>
session_set_save_handler
bool session_set_save_handler(string open, string close, string read, string write, string destroy, string gc)
open
|
Session init function
|
close
|
Session shutdown function
|
read
|
Session read function
|
write
|
Session write function
|
destroy
|
Destroy session function
|
gc
|
Garbage collection
function
|
Sets handlers for custom session
functions.
Returns:
TRUE on success; FALSE on error
Description:
This function takes six arguments that describe the functions
used when creating your own session-handling functions. Each function can have
any name, but the names must be passed in the correct order. In addition, each
function must return the correct information. Using this function, it's possible
to write any session handler that you want, including those that store their
information in a database, text files, DBM files, or shared memory.
bool open(string
save_path, string session_name )
Executed when a session is initialized; can be used for various
functions such as initializing variables. The save path and session name can
come from the PHP initialization file or via the session_save_path()
and session_name() functions. Should return TRUE on success,
FALSE on error.
bool close()
Executed on shutdown of a session. Can be used to free memory
or to destroy variables. Should return TRUE on success, FALSE
on error.
mixed read(string
session_ID)
Called whenever a session is started. If called with a session
ID, the data associated with that session ID must be read and returned as a
serialized string. If no session ID is passed, an empty string is returned.
Should return FALSE on error.
bool write(string
session_ID , string value )
Updates or adds new session data. The data to be written must
be serialized. Should return TRUE on success, FALSE on
error.
bool destroy(string
session_ID )
Removes any session data from the data store. Must return
TRUE on success, FALSE on error.
bool gc(string
max_lifetime )
Called at session startup. Designed to remove any sessions with
a lifetime greater than the maximum. Should return TRUE on success,
FALSE on failure.
Version:
Existing since version 4.0
Example:
Create new session handler
session_set_save_handler("user_open","user_close","user_read","user_write",
"user_destroy","user_gc")
