Ch.9a Session

8/9/2019 Ch.9a Session

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Session Management

By Tony Chun Kuen WONG

Example 1

.

http://isem03.hkbu.edu.hk/~isemuser20/s.


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Connecting to specific user

Session support in PHP consists of a way to

accesses. This enables you to build more

appeal of your web site.

A visitor accessing your web site is assigned- , .

either stored in a cookie on the user side or isro a ated in the URL.


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The session support allows you to registerarbitrary numbers of variables to bepreserved across requests. When a visitor

accesses your site, PHP will checkautomatically (if session.auto_start is set to 1)or on your request (explicitly throughsession_start() or implicitly through

session_register()) whether a s ecificsession id has been sent with the request. If

this is the case, the prior saved environmentis recreated.

_

http://isem03.hkbu.edu.hk/~isemuser20/session/session02.php

Listing (session02.php)

Session 02 example by Tony WONG - Start or

resume a session


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or ng w ess on ar a es

session_register ( ) - Register one or more variables with

the current session.

session_register( ) variable number of arguments, any of

or an array consisting of such variable names or otherarrays. For each encountered variable name,session_register( ) registers the global variable named byit with the current session.

This function returns true when the variable issuccessfull re istered with the session.

Register variables session03.phphttp://isem03.hkbu.edu.hk/~isemuser20/session/session03.php

Session 03 example by Tony WONG -

registering variables with a session

< ea >


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Session_encode ( )

session_encode ( ) - Encodes thecurrent session data as a string

session_encode() returns a string withthe contents of the current session

encoded within.

.http://isem03.hkbu.edu.hk/~isemuser20/session/session04.php

session_start();?>

Session 04 example by Tony WONG -

print "Your chosen products are :\n\n";printu ._ pro uc . n ._

SION[product2].\n\n";?>

o y


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Session variables are store in a writabledirectory in the isem03.hkbu.edu.hk

Record multiple products session05.phphttp://isem03.hkbu.edu.hk/~isemuser20/session/session05.php

< >

Session 05 example by Tony WONG - registeran array variable o y

Product Choice Page


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Session05.php continue

Nissian Bluebird

Honda Civic

Toyota corolla Benz

Landrover

< select>

orm

=" ".

Accessin Session variables session06. h Session 06 example by Tony WONG - accessingsession variables

A Content PageBack to product choice page


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es roy ng sess ons an nse ng var a es

session_destroy() destroys all of the data.

This function returns true on success anda se on a ure to estroy t e sess on ata.

The session_unset( ) function free's all

session variables currentl re istered.

m Session07.php by Tony WONG - destroying andunsetting variables

Demo destroy and unset variables


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print "session start again
";sess on_reg s er new es ;$_SESSION[newtest] = 10;print "
";

"_ . before unset and destroy
";

print session_encode()." session variable"

print "

";session_unset();session destro_

print $_SESSION[newtest]." value of variableafter after unset and destroy

";rint session encode ." session variable_reocrded";print "

";

print "end of testing
";?>

ass ng ess on s n e query s r ng

What happen if a browser dont acceptcookies;

en you nee to pass t e sess on yyourself by

.

.


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er sess on unc ons

_ re urns e name o ecurrent session. If name is specified, the

value.

The session name references the session id.

alphanumeric characters; it should be shortand descri tive i.e. for users with enabledcookie warnings). The session name is resetto the default value stored in session name at

request startup time. Thus, you need to callsession_name( ) for every request (ande ore sess on_s ar or

session_register( ) are called).


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sess on_unreg ster unreg sters(forgets) the global variable namednamefrom the current session.

This function returns true when thevariable is successfully unregisteredfrom the session.

sess on_ s_reg stere pro ucts

returns true if there is a variable with the

name pro uc sreg s ere n e currensession.


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sess on_ eco e

decodes the session data in data,se ng var a es s ore n e sess on.

Last example

session08.php


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Examples using session

User informationShopping Cart

Documents

Ch.9a Session