PHP Login Script Tutorial

Posted July 30th, 2010 by

Learn to create a simple login system with php + mysql script, this tutorial easy to follow, teach you step by step.

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Overview

In this tutorial create 3 files
1. main_login.php
2. checklogin.php
3. login_success.php

Step
1. Create table “members” in database “test”.
2. Create file main_login.php.
3. Create file checklogin.php.
4. Create file login_success.php.
5. Create file logout.php

Step1:

Create table “members”

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<p>CREATE TABLE `members` (<br>
  `id` int(4) NOT NULL auto_increment,<br>
  `username` varchar(65) NOT NULL default '',<br>
  `password` varchar(65) NOT NULL default '',<br>
  PRIMARY KEY (`id`)<br>
  ) TYPE=MyISAM AUTO_INCREMENT=2 ;</p>
<p>-- <br>
  -- Dumping data for table `members`<br>
  -- </p>

1

<p>INSERT INTO `members` VALUES (1, 'john', '1234');</p>

db members PHP Login Script Tutorial

Step2:

Create file main_login.php

member login PHP Login Script Tutorial
View In Browser

|—|——————— code ——————–|—| 

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<p><table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC"><br>
  <tr><br>
<form name="form1" method="post" action="checklogin.php"><br>
  <td><br>
  <table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF"><br>
  <tr><br>
  <td colspan="3"><strong>Member Login </strong></td><br>
  </tr><br>
  <tr><br>
  <td width="78">Username</td><br>
  <td width="6">:</td><br>
  <td width="294"><input name="myusername" type="text" id="myusername"></td><br>
  </tr><br>
  <tr><br>
  <td>Password</td><br>
  <td>:</td><br>
  <td><input name="mypassword" type="text" id="mypassword"></td><br>
  </tr><br>
  <tr><br>
  <td> </td><br>
  <td> </td><br>
  <td><input type="submit" name="Submit" value="Login"></td><br>
  </tr><br>
  </table><br>
  </td><br>
</form><br>
  </tr><br>
  </table></p>

Step3:

Create file checklogin.php

|—|——————— code ——————–|—|

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<p><?php<br>
$host="localhost"; // Host name <br>
$username=""; // Mysql username <br>
$password=""; // Mysql password <br>
$db_name="test"; // Database name <br>
$tbl_name="members"; // Table name </p>
<p>// Connect to server and select databse.<br>
  mysql_connect("$host", "$username", "$password")or die("cannot connect"); <br>
  mysql_select_db("$db_name")or die("cannot select DB");</p>
<p>// username and password sent from form <br>
  $myusername=$_POST['myusername']; <br>
  $mypassword=$_POST['mypassword']; </p>
<p>// To protect MySQL injection (<a href="http://us.php.net/mysql_real_escape_string" target="_blank">more detail about MySQL injection</a>)<br>
  $myusername = stripslashes($myusername);<br>
  $mypassword = stripslashes($mypassword);<br>
  $myusername = mysql_real_escape_string($myusername);<br>
  $mypassword = mysql_real_escape_string($mypassword);</p>
<p>$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";<br>
  $result=mysql_query($sql);</p>
<p>// Mysql_num_row is counting table row<br>
  $count=mysql_num_rows($result);<br>
// If result matched $myusername and $mypassword, table row must be 1 row</p>
<p>if($count==1){<br>
// Register $myusername, $mypassword and redirect to file "login_success.php"<br>
session_register("myusername");<br>
session_register("mypassword"); <br>
header("location:login_success.php");<br>
}<br>
else {<br>
echo "Wrong Username or Password";<br>
}<br>
?></p>

Step4:

Create file login_success.php

|—|——————— code ——————–|—| 

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<p>// Check if session is not registered , redirect back to main page. <br>
// Put this code in first line of web page. <br>
  <? <br>
  session_start();<br>
  if(!session_is_registered(myusername)){<br>
  header("location:main_login.php");<br>
  }<br>
  ?><br>
  <br>
  <html><br>
  <body><br>
  Login Successful<br>
  </body><br>
  </html></p>

Step5:

Logout.php

If you want to logout, create this file

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// Put this code in first line of web page. <br>
<? <br>
session_start();<br>
session_destroy();<br>
?>

Step6:

For PHP5 User – checklogin.php

|—|——————— code ——————–|—| 

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<?php<br>
ob_start();<br>
$host="localhost"; // Host name <br>
$username=""; // Mysql username <br>
$password=""; // Mysql password <br>
$db_name="test"; // Database name <br>
$tbl_name="members"; // Table name
<p>// Connect to server and select databse.<br>
  mysql_connect("$host", "$username", "$password")or die("cannot connect"); <br>
  mysql_select_db("$db_name")or die("cannot select DB");</p>
<p> // Define $myusername and $mypassword <br>
  $myusername=$_POST['myusername']; <br>
  $mypassword=$_POST['mypassword']; </p>
<p>// To protect MySQL injection (<a href="http://us.php.net/mysql_real_escape_string">more detail about MySQL injection</a>)<br>
  $myusername = stripslashes($myusername);<br>
  $mypassword = stripslashes($mypassword);<br>
  $myusername = mysql_real_escape_string($myusername);<br>
  $mypassword = mysql_real_escape_string($mypassword);</p>
<p>$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";<br>
  $result=mysql_query($sql);</p>
<p>// Mysql_num_row is counting table row<br>
  $count=mysql_num_rows($result);<br>
// If result matched $myusername and $mypassword, table row must be 1 row</p>
<p>if($count==1){<br>
// Register $myusername, $mypassword and redirect to file "login_success.php"<br>
session_register("myusername");<br>
session_register("mypassword"); <br>
header("location:login_success.php");<br>
}<br>
else {<br>
echo "Wrong Username or Password";<br>
}</p>
<p>ob_end_flush();<br>
?></p>

Step7:

Encrypting Password – Make your Login More Secure

encrypt password PHP Login Script Tutorial

Read more about encrypting password here



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6 ResponsesLeave a comment
  • Jhon Mary
    July 31, 2010 at 7:42 am
    Reply

    Great Blog here my friend! Very informative, I appreciate all the information that you just shared with me very much and I’ll be back to read more in the future.

  • Tutorial Lounge
    August 2, 2010 at 11:20 am
    Reply

    short and useful tutorial with informative tips. thanks

  • tinnitis
    August 9, 2010 at 11:50 pm
    Reply

    Well I found this on Digg, and I like it so I dugg it!

  • Reinaldo Rodriguel
    August 21, 2010 at 8:48 am
    Reply

    Great Blog.Check Out Miniurlz To Make Your Urls Shorter

  • mode20100
    August 25, 2010 at 6:57 pm
    Reply

    A+ would read again

  • deranjer
    October 17, 2010 at 6:20 pm
    Reply

    Session_register is depreciated and should not be used anymore. You should update your script to use $_SESSION instead.

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