Php program code for simple user login

Last Update:2017-01-13 Source: Internet

Author: User

Tags php file rtrim

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User login system (no database)

Key code:
LoginUI. php mainly includes:
---------------------------

The code is as follows:	Copy code
<? Php If (error! = Null ){ $ Error = $ _ GET ['error']; Echo $ error; Echo "login failed. Please check your username (yugaga) and password (123456 )"; } ?>

----------------------------
Some prompts are displayed after the logon fails.
In loginCheck. php
-----------------------------

The code is as follows:

Copy code

<? Php
$ Username = $ _ POST ['username'];
$ Password = $ _ POST ['password'];
If ($ username = "yugaga" & $ password = "123456 & Prime ;){
$ Host = $ _ SERVER ['http _ host'];
$ Uri = rtrim (dirname ($ _ SERVER ['php _ SELF ']),'/');
$ Extra = 'Welcome. php? User = '. $ username;
Header ("Location: http: // $ host $ uri/$ extra");
} Else {
$ Host = $ _ SERVER ['http _ host'];
$ Uri = rtrim (dirname ($ _ SERVER ['php _ SELF ']),'/');
$ Extra = 'loginui. php? Error = failer ';
Header ("Location: http: // $ host $ uri/$ extra");
}
?>

------------------------------------
It mainly verifies the submitted information. Here, regular matching and global variables are used.
Main output information in welcome. php
------------------------------------

The code is as follows:	Copy code
<? Php $ Username = $ _ GET ['user']; Echo "welcome". $ username. "login "; ?>

User logon system (with database)

We tried to connect to the database. Two files are added, one SqlHepler. php, used to obtain the database connection, a userService. php file, used to process user-related operations, such as user login verification. In this session, we just added a function checkUserLogin ($ username, $ password ), determine whether the user has successfully logged on based on the user name and password! ~

Html code

The code is as follows:

Copy code

<! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd">
<Html>
<Head>
<Title> simple logon demonstration </title>
</Head>

<Body>
<Center>
<Form action = "loginCheck. php" method = "post">
User account: <input type = "text" name = "username" size = "20"/> <br/>
User secrets: <input type = "password" name = "password" size = "20"/> <br/>
<Input type = "submit" value = "submit"/>
</Form>
<? Php
$ Error = $ _ GET ['error'];
If ($ error = 'failer '){
Echo "login failed. Please check your username (yugaga) and password (123456 )";
}
?>
</Center>

</Body>
</Html>

Main code:
-----------------------------------
<? Php
Include_once 'sqlhelper. Php ';
Function checkUserLogin ($ username, $ password ){
$ Res = mysql_query ("select * from users where username = '". $ username ."'");
If ($ listuser = mysql_fetch_array ($ res ))! = Null ){
If ($ listuser [2] ==$ password ){
Return true;
}
} Else {
Return false;
}
}
?>
-------------------------------------
SqlHelper code:
------------------------------------
<? Php
$ Server = "localhost ";
$ User = "root ";
$ Pass = "";
$ Con = mysql_connect ($ server, $ user, $ pass );
Mysql_select_db ("login", $ con );
?>
----------------
Code after successful login

<? Php
$ Username = $ _ GET ['user'];
Echo "welcome". $ username. "login ";
?>

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