04html form get post login system

8/14/2019 04html Form Get Post Login System

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GeshanManandhar.comGeshanManandhar.com 11

PHP Day 4PHP Day 4

Geshan ManandharGeshan ManandharDeveloper,Developer,

Young Innovations Private LimitedYoung Innovations Private Limited

www.geshanmanandhar.comwww.geshanmanandhar.com

http://www.php.net


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GeshanManandhar.com 2

HTML FormsHTML Forms

.

For display formatted forms use tables.For display formatted forms use tables.

For more seeFor more see

http://www.w3schools.com/html/html_forms.asphttp://www.w3schools.com/html/html_forms.asp
http://www.w3schools.com/html/html_forms.asphttp://www.w3schools.com/html/html_forms.asphttp://www.w3schools.com/html/html_forms.asp


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Require and IncludeRequire and Include

require(path/to/file_name.php)require(path/to/file_name.php)

include(path/to/file_name.php)include(path/to/file_name.php) Difference is require will throw a Fatal error isDifference is require will throw a Fatal error is

file required is not found include will justfile required is not found include will justthrow a warning.throw a warning.

require_once(path/to/file_name.php);require_once(path/to/file_name.php);

include_once(path/to/file_name.php);include_once(path/to/file_name.php);To require or include a file just once.To require or include a file just once.


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Session ManagementSession Management

session_start Initialize session datasession_start Initialize session data

$_SESSION[index] = value;$_SESSION[index] = value;

$_SESSION[user_name] = $user_name;$_SESSION[user_name] = $user_name;session_destroy Destroys all datasession_destroy Destroys all data

registered to a sessionregistered to a session


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A simple login interfaceA simple login interface


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Login Check functionLogin Check function

Getting Variables and starting session.Getting Variables and starting session.


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Login Check functionLogin Check function

The Function definitionThe Function definition

function check_login($user_name, $pass_word){function check_login($user_name, $pass_word){

if(($user_name=="admin") && ($pass_word === "test"))if(($user_name=="admin") && ($pass_word === "test"))

{{

//set session//set session

$_SESSION['user_name'] = $user_name;$_SESSION['user_name'] = $user_name;$_SESSION['user_logged_in'] = true;$_SESSION['user_logged_in'] = true;return 1;return 1;

}}

else{else{return 0;return 0;

}}

}}


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Login check functionLogin check function

Function call and processFunction call and process$user_ok = check_login($user_name, $pass_word); //called from$user_ok = check_login($user_name, $pass_word); //called from

check_login_function.phpcheck_login_function.php

if($user_ok){if($user_ok){

header("Location: logged_in.php"); /* Redirect browser */header("Location: logged_in.php"); /* Redirect browser */

}}

else {else {

header("Location: not_logged_in.php");header("Location: not_logged_in.php");

}}

?>?>


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Either you login or are notEither you login or are not

logged inlogged in


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Session to authenticate usersSession to authenticate users

Address security issues.Address security issues.

Put content that should be seen byPut content that should be seen by

logged in users or even by user type.logged in users or even by user type.

User module and session managementUser module and session management

is essential to almost every system.is essential to almost every system.


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QuestionsQuestions


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Lets start practiceLets start practice

Build your own login system with upto 3Build your own login system with upto 3user name and password combinationuser name and password combination

with user of array,with user of array, refer to code ofrefer to code of

Day04Day04..Among the 3 one should be of typeAmong the 3 one should be of type

admin and remaining two of type user.admin and remaining two of type user.

The logged in page should not beThe logged in page should not beaccessible directly after typing fullaccessible directly after typing fullURL/address in the address bar.URL/address in the address bar.

04html form get post login system

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