Home
>
Web Development
>
Developing A Login System With PHP And MySQL

Developing A Login System With PHP And MySQL

Most interactive websites nowadays would require a user to log in into the website's system in order to provide a customized experience for the user. Once the user has logged in, the website will be able to provide a presentation that is tailored to the user's preferences.

A basic login system typically contains 3 components:

1. The component that allows a user to register his preferred login id and password

2. The component that allows the system to verify and authenticate the user when he subsequently logs in

3. The component that sends the user's password to his registered email address if the user forgets his password

Such a system can be easily created using PHP and MySQL.

================================================================

Component 1 ? Registration

Component 1 is typically implemented using a simple HTML form that contains 3 fields and 2 buttons:

1. A preferred login id field
2. A preferred password field
3. A valid email address field
4. A Submit button
5. A Reset button

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

[form name="register" method="post" action="register.php"]

[input name="login id" type="text" value="loginid" size="20"/][br]

[input name="password" type="text" value="password" size="20"/][br]

[input name="email" type="text" value="email" size="50"/][br]

[input type="submit" name="submit" value="submit"/]

[input type="reset" name="reset" value="reset"/] [/form]

The following code excerpt can be used as part of register.php to process the registration. It connects to the MySQL database and inserts a line of data 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 excerpt assumes that the MySQL table that is used to store the registration data is named tbl_login and contains 3 fields ? the loginid, password and email fields. The values of the $loginid, $password and $email variables are passed in from the form in register.html using the post method.

================================================================

Component 2 ? Verification and Authentication

A registered user will want to log into the system to access the functionality provided by the website. The user will have to provide his login id and password for the system to verify and authenticate.

This is typically done through a simple HTML form. This HTML form typically contains 2 fields and 2 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 excerpt is a typical example. When the user has filled in all the fields, the authenticate.php page is called when the user clicks on the Submit button.

[form name="authenticate" method="post" action="authenticate.php"]

[input name="login id" type="text" value="loginid" size="20"/][br]

[input name="password" type="text" value="password" size="20"/][br]

[input type="submit" name="submit" value="submit"/]

[input type="reset" name="reset" value="reset"/] [/form]

The following code excerpt can be used as part of authenticate.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 connect to 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 try again.";

exit(); } else{

print "successfully logged into system.";

//proceed to perform website's functionality ? e.g. present information to the user }

As in component 1, the code excerpt assumes that the MySQL table that is used to store the registration data is named 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 3 ? Forgot Password

A registered user may forget his password to log into the website's system. In this case, the user will need to supply his loginid for the system to retrieve his password and send the password to the user's registered email address.

This is typically done through a simple HTML form. This HTML form typically contains 1 field and 2 buttons:

1. A login id field
2. A Submit button
3. A Reset button

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

[form name="forgot" method="post" action="forgot.php"]

[input name="login id" type="text" value="loginid" size="20"/][br]

[input type="submit" name="submit" value="submit"/]

[input type="reset" name="reset" value="reset"/] [/form]

The following code excerpt can be used as part 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 connect to 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()==0){

print "no such login in the system. please try 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 1, the code excerpt assumes that the MySQL table that is used to store the registration data is named tbl_login and contains 3 fields ? the loginid, password and email fields. The value of the $loginid variable is passed from the form in forgot.html using the post method.

================================================================

Conclusion

< p>The above example is to illustrate how a very basic login system can be implemented. The example can be enhanced to include password encryption and additional functionality ? e.g. to allow users to edit their login information.

Used with the author's permission.
This article is written by John L.
John L is the Webmaster of designer banners (designer banners).

home cleaning services Deerfield ..

In The News:

DoorDash confirms data breach exposing customer names, emails, addresses after social engineering attack. Learn how to protect yourself from scams.

Concerned about Google's AI scanning your Gmail? Learn how to disable Gemini features that access your emails, Drive files and Chat messages for privacy.

Google warns Android users about dangerous fake VPN apps hiding malware that steals passwords, banking details and personal data from phones and tablets.

Apple's digital passport feature lets iPhone users breeze through TSA checkpoints this holiday season using Digital ID technology at 250+ airports.

A new phishing scam targets family photos with fake "Cloud Storage Full" alerts. Criminals steal credit card information through fake sites. Learn protection tips.

South Korean scientists create ultra-thin fabric muscles that turn clothes into robotic assistants, lifting 33 pounds while weighing under half an ounce.

Archer Aviation has acquired Hawthorne Airport for $126M to launch an LA air taxi network ahead of the 2028 Olympics, featuring AI-powered eVTOL operations and next-gen aviation tech.

Stay up to date on the latest AI technology advancements and learn about the challenges and opportunities AI presents now and for the future.

Fake AI apps disguised as "ChatGPT" and "DALL·E" are flooding app stores with dangerous malware that steals data and monitors users without detection.

Fake buyers demand specific vehicle reports from unknown sites to steal credit card information from car sellers, but warning signs can help identify these scams before paying.

Android users can now manage apps across multiple devices more easily with Google Play Store's updated remote uninstall button in the latest update.

NASA's Perseverance rover discovers shiny metallic rock on Mars that could be a meteorite from an ancient asteroid, containing high levels of iron and nickel.

Holiday scams spike during Black Friday and Cyber Monday as criminals exploit your leaked personal data. Learn how to protect yourself from fake stores and phishing.

Commerce Department proposes TP-Link router ban over Chinese security risks. Learn how this potential prohibition could affect your home network and devices.

Hyundai AutoEver America suffered a data breach affecting 2,000 current and former employees, exposing names, Social Security numbers and driver's license information.

Washington court rules automated license plate reader images are public records, even when stored by vendors like Flock Safety, setting precedent for transparency.

Fake airline texts claiming flight cancellations are targeting travelers with convincing scams. Learn how cybercriminals steal personal data and credit card info.

Discover how iOS 26's new Adaptive Power feature automatically extends iPhone battery life by learning your usage patterns and adjusting performance intelligently.

New TikTok malware campaign tricks users into running PowerShell commands that download Aura Stealer, which steals credentials and authentication tokens.

Gaia Family offers fixed upfront pricing for IVF cycles with unlimited embryo transfers and financial protection, partnering with over 100 U.S. fertility clinics.

The Jetsons Act aims to position Pennsylvania as a leader in advanced air mobility by establishing regulations for hybrid ground-air vehicles.

Fake Geek Squad invoice emails are targeting users with convincing charges and urgent phone numbers to steal personal information and money.

Fox News Digital's artificial intelligence newsletter digs into a robot in Russia that faceplanted, George Clooney's alarm and OpenAI's rivalry with the New York Times.

Major data breach at Conduent exposes personal information of 10+ million people. Government contractor hit by cyberattack affecting Medicaid, child support systems.

Texas startup Janta Power raises $5.5M for innovative vertical solar towers that generate 50% more energy than traditional panels while using just one-third the land.

Developing A Login System With PHP And MySQL

Web Development