Using Session Control in PHP HTTP is a stateless protocol No built in way of maintaining a state between two transactions PHP Sessions Unique session ID random number Generated by PHP Stored on client for the lifetime of the session ID: 434624
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Slide1
Chapter 23
Using Session Control in PHPSlide2
HTTP is a stateless protocol
No built in way of maintaining a state between two transactionsSlide3
PHP Sessions
Unique session ID – random number
Generated by PHP
Stored on client for the lifetime of the session
Stored as a cookieSlide4
Page1.php
<h1>Page 1</h1>
<?
php
session_start
();
$_SESSION['
sess_var
'] = "Hello World";
echo 'The contents of $_SESSION[\'
sess_var
\'] is '
.$_SESSION['
sess_var
'].'<
br
/>';
?>
<a
href
="page2.php">Next page</a>Slide5
Start_session
Checks to see whether there is a current session.
If not, it not it will create one.Slide6
Session variables
Superglobal
array $_SESSION
To create a session variable:
$_SESSION[‘id’] = 99;
When finished
u
nset($_SESSION[‘id’]);Slide7
Finish the session
session_destroy
( );Slide8
Page1.php
<h1>Page 1</h1>
<?
php
session_start
();
$_SESSION['
sess_var
'] = "Hello World";
echo 'The contents of $_SESSION[\'
sess_var
\'] is '
.$_SESSION['
sess_var
'].'<
br
/>';
?>
<a
href
="page2.php">Next page</a>Slide9
Page1.php
http://
cscdb.nku.edu/csc301/frank/Chapter23/page1.php
Slide10
Page2.php
<h1>Page 2</h1>
<?
php
session_start
();
echo 'The contents of $_SESSION[\'
sess_var
\'] is '
.$_SESSION['
sess_var
'].'<
br
/>';
unset($_SESSION['
sess_var
']);
?>Slide11
Page3.php
<h1>Page 3</h1>
<?
php
session_start
();
echo 'The contents of $_SESSION[\'
sess_var
\'] is '
.$_SESSION['
sess_var
'].'<
br
/>';
session_destroy
();
?>