A login system with PHP and MySQL

Many interactive websites today need a user to log in into the web site’s system to produce a customized experience for the user. Once the user has logged in, the website can be able to provide a presentation that is personalized to the user’s preferences.

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

Element one: Permits registration of most popular login Id and password.

This can be created in straightforward HTML form that contains 3 fields and a pair of buttons:

1. A most well-liked login id field

2. A preferred password field

3. A valid email address field

4. A Submit button

5. A Reset button

Shall we say the form is coded into a file named register.html. The subsequent HTML code extract could be 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.

[type name="register" technique="post" action="register.php"]
[input name="login id" kind="text" worth="loginid" size="20"/][br]
[input name="password" sort="text" value="password" size="20"/][br]
[input name="email" kind="text" value="email" size="50"/][br]
[input sort="submit" name="submit" value="submit"/]
[input kind="reset" name="reset" worth="reset"/]
[/kind]

The subsequent code extract can additionally be used as half of register.php to method 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 hook up with 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’s used to store the registration information is called 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.

Component two: Verification and authentication of the user.

In this the HTML kind usually contains 2 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 kind is coded into a file named authenticate.html. The subsequent HTML code extract could be a typical example. When the user has filled in all the fields, the authenticate.php page is named when the user clicks on the Submit button.

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

The subsequent code extract will be used as part 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 select 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 in the system. please attempt again.”;
exit();
}
else{
print “successfully logged into system.”;
//proceed to perform web site’s functionality - e.g. gift info to the user
}

As in part one, the code excerpt assumes {that the} MySQL table that is used to store the registration data is known as tbl_login and contains three 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.

Element 3:  When the user forgets his logion password this third part sends his password to the users registered email address.

The HTML type typically contains 1 field and a pair of buttons:

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

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

[type name="forgot" methodology="post" action="forgot.php"]
[input name="login id" type="text" value="loginid" size="20"/][br]
[input sort="submit" name="submit" worth="submit"/]
[input kind="reset" name="reset" worth="reset"/]
[/type]

The following code excerpt will be used as half of forgot.php to process 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 hook up 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 component one, the code excerpt assumes {that the} MySQL table that is used to store the registration information is known as tbl_login and contains three fields - the loginid, password and email fields. The worth of the $loginid variable is passed from the form in forgot.html using the post method.

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

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