Many interactive websites these days need a user to log in into the website’s system to provide a customized experience for the user. Once the user has logged in, the web site will be in a position to provide a presentation that is personalised to the user’s preferences.

A basic login system usually contains three components that will be created using PHP and MySQL :

Element one: Permits registration of preferred login Id and password.

This can be created in easy HTML kind that contains three fields and a pair of buttons:

1. A most well-liked login id field

2. A most well-liked password field

3. A valid email address field

4. A Submit button

5. A Reset button

Shall we say the shape is coded into a file named register.html. The subsequent HTML code extract is a typical example. When the user has filled in all the fields and clicks on the submit button, the register.php page is called for.

[form name="register" method="post" action="register.php"]
[input name="login id" sort="text" price="loginid" size="20"/][br]
[input name="password" kind="text" value="password" size="20"/][br]
[input name="email" sort="text" value="email" size="fifty"/][br]
[input sort="submit" name="submit" price="submit"/]
[input type="reset" name="reset" price="reset"/]
[/form]

The subsequent code extract will conjointly be used as part of register.php to process the registration. The code connects to the MySQL database and inserts a line of information into the table used to store the registration information.

@mysql_connect(“localhost”, “mysql_login”, “mysql_pwd”) or die(“Cannot connect to DB!”);
@mysql_select_db(“tbl_login”) or die(“Cannot select DB!”);
$sql=”INSERT INTO login_tbl (loginid, password and email) VALUES (“.$loginid.”,”.$password.”,”.$email.”)”;
$r = mysql_query($sql);
if(!$r) {
$err=mysql_error();
print $err;
exit();
}

The code extract assumes {that the} MySQL table that is used to store the registration information is named tbl_login and contains three fields – the loginid, password and email fields. The values of the $loginid, $password and $email variables are passed in from the shape in register.html using the post method.

Element two: Verification and authentication of the user.

During this the HTML form typically contains a pair of fields and a couple of buttons:

1. A login id field

2. A password field

3. A Submit button

4. A Reset button

Assume that such a form is coded into a file named authenticate.html. The following HTML code extract is a typical example. When the user has crammed in all the fields, the authenticate.php page is named when the user clicks on the Submit button.

[form name="authenticate" technique="post" action="authenticate.php"]
[input name="login id" kind="text" value="loginid" size="20"/][br]
[input name="password" type="text" worth="password" size="20"/][br]
[input kind="submit" name="submit" value="submit"/]
[input type="reset" name="reset" price="reset"/]
[/kind]

The subsequent code extract can be used as half of authenticate.php to method the login request. It connects to the MySQL database and queries the table used to store the registration information.

@mysql_connect(“localhost”, “mysql_login”, “mysql_pwd”) or die(“Cannot connect with DB!”);
@mysql_select_db(“tbl_login”) or die(“Cannot choose DB!”);
$sql=”SELECT loginid FROM login_tbl WHERE loginid=’”.$loginid.”‘ and password=’”.$password.”‘”;
$r = mysql_query($sql);
if(!$r) {
$err=mysql_error();
print $err;
exit();
}
if(mysql_affected_rows()==0){
print “no such login within the system. please strive again.”;
exit();
}
else{
print “successfully logged into system.”;
//proceed to perform website’s functionality – e.g. present info to the user
}

As in element one, the code excerpt assumes {that the} MySQL table that is used to store the registration information is called tbl_login and contains 3 fields – the loginid, password and email fields. The values of the $loginid and $password variables are passed in from the form in authenticate.html using the post method.

Component three:  When the user forgets his logion password this third component sends his password to the users registered email address.

The HTML kind usually contains 1 field and a pair of buttons:

•  A login id field
•  A Submit button
•  A Reset button

Assume that such a type is coded into a file named forgot.html. The following HTML code excerpt may be a typical example. When the user has crammed in all the fields, the forgot.php page is named when the user clicks on the Submit button.

[kind name="forgot" methodology="post" action="forgot.php"]
[input name="login id" sort="text" price="loginid" size="twenty"/][br]
[input type="submit" name="submit" value="submit"/]
[input type="reset" name="reset" price="reset"/]
[/kind]

The subsequent code excerpt can be used as half of forgot.php to method the login request. It connects to the MySQL database and queries the table used to store the registration information.

@mysql_connect(“localhost”, “mysql_login”, “mysql_pwd”) or die(“Cannot connect with DB!”);
@mysql_select_db(“tbl_login”) or die(“Cannot select DB!”);
$sql=”SELECT password, email FROM login_tbl WHERE loginid=’”.$loginid.”‘”;
$r = mysql_query($sql);
if(!$r) {
$err=mysql_error();
print $err;
exit();
}
if(mysql_affected_rows()==zero){
print “no such login in the system. please attempt again.”;
exit();
}
else {
$row=mysql_fetch_array($r);
$password=$row["password"];
$email=$row["email"];

$subject=”your password”;
$header=”from:you@yourdomain.com”;
$content=”your password is “.$password;
mail($email, $subject, $row, $header);

print “An email containing the password has been sent to you”;
}

As in element 1, the code excerpt assumes {that the} MySQL table that’s used to store the registration information is called tbl_login and contains three fields – the loginid, password and email fields. The price of the $loginid variable is passed from the shape in forgot.html using the post method.

This is often how a basic login system can be created. The software developer will embody extra tools like password encryption, access to the user profile in case they wish to edit their profile etc.

This text has been compiled by the content development team at Pegasus InfoCorp that pulls subject matter specialists from different work domains. They will be contacted through the Pegasus InfoCorp web site at information@pegasusinfocorp.com. Pegasus InfoCorp is an India primarily based internet design, internet development and on-line/offline software development company. Please visit http://www.pegasusinfocorp.com to browse more articles and know additional concerning us!

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