A login system with PHP and MySQL
Several interactive websites these days need a user to log in into the website’s system to provide a customized expertise for the user. Once the user has logged in, the web site can be able to provide a presentation that is personalised to the user’s preferences.
A basic login system typically contains three components that can be created using PHP and MySQL :
Element 1: Permits registration of most well-liked login Id and password.
This is created in straightforward HTML kind that contains 3 fields and a pair of buttons:
1. A most popular 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 shape is coded into a file named register.html. The following HTML code extract is a typical example. When the user has stuffed in all the fields and clicks on the submit button, the register.php page is termed for.
[kind name="register" technique="post" action="register.php"]
[input name="login id" kind="text" worth="loginid" size="20"/][br]
[input name="password" type="text" value="password" size="20"/][br]
[input name="email" kind="text" value="email" size="50"/][br]
[input type="submit" name="submit" price="submit"/]
[input kind="reset" name="reset" worth="reset"/]
[/kind]
The subsequent code extract can conjointly be used as half of register.php to method the registration. The code connects to the MySQL database and inserts a line of knowledge 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 data 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 a pair of: Verification and authentication of the user.
In this the HTML kind usually contains a pair of 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 kind is coded into a file named authenticate.html. The subsequent HTML code extract may be a typical example. When the user has stuffed 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" worth="loginid" size="20"/][br]
[input name="password" type="text" value="password" size="twenty"/][br]
[input type="submit" name="submit" value="submit"/]
[input kind="reset" name="reset" value="reset"/]
[/kind]
The following code extract can be used as half 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 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()==zero){
print “no such login within the system. please attempt again.”;
exit();
}
else{
print “successfully logged into system.”;
//proceed to perform website’s functionality – e.g. gift data to the user
}
As in component one, the code excerpt assumes {that the} MySQL table that’s used to store the registration knowledge 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 shape in authenticate.html using the post method.
Part 3: When the user forgets his logion password this third part sends his password to the users registered email address.
The HTML kind typically contains one field and 2 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 subsequent HTML code excerpt may 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.
[form name="forgot" technique="post" action="forgot.php"]
[input name="login id" sort="text" worth="loginid" size="20"/][br]
[input sort="submit" name="submit" price="submit"/]
[input sort="reset" name="reset" price="reset"/]
[/form]
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 connect with DB!”);
@mysql_select_db(“tbl_login”) or die(“Cannot choose 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 part 1, the code excerpt assumes {that the} MySQL table that’s used to store the registration data is called tbl_login and contains three fields – the loginid, password and email fields. The price 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 embrace additional tools like password encryption, access to the user profile in case they wish to edit their profile etc.
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