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PHP Login script tutorial

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PHP Login script tutorial

Post by Admin|Gana on Sat Feb 06, 2010 2:34 pm

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PHP Login script tutorial
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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<td align="center"> </td>
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google_protectAndRun("ads_core.google_render_ad", google_handleError, google_render_ad);
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<td height="20">Overview</td>
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<td>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
If you don't know how to create databse, click here</td>
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<table bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="3" width="100%">
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<td><table bgcolor="#f4f9fb" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td width="5%"></td>
<td width="95%">Create table "members"</td>
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<td colspan="2" valign="top"><table border="0" cellpadding="0" cellspacing="5" width="100%">

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CREATE TABLE `members` (
`id` int(4) NOT NULL auto_increment,
`username` varchar(65) NOT NULL default '',
`password` varchar(65) NOT NULL default '',
PRIMARY KEY (`id`)
) TYPE=MyISAM AUTO_INCREMENT=2 ;

--
-- Dumping data for table `members`
--

INSERT INTO `members` VALUES (1, 'john', '1234');</td>
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<table bgcolor="#dfebf2" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td><table bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="3" width="100%">
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<td><table bgcolor="#f4f9fb" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td width="5%"></td>
<td width="95%">Create file main_login.php</td>
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<td colspan="2" bgcolor="#eeeeee"></td>
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<td colspan="2" valign="top"><table border="0" cellpadding="0" cellspacing="5" width="100%">

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<td align="center">View In Browser

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<td class="Arial"> ############### Code

<table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
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<form name="form1" method="post" action="checklogin.php">
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
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<td colspan="3"><strong>Member Login </strong></td>
</tr>
<tr>
<td width="78">Username</td>
<td width="6">:</td>
<td width="294"><input name="myusername" type="text" id="myusername"></td>
</tr>
<tr>
<td>Password</td>
<td>:</td>
<td><input name="mypassword" type="text" id="mypassword"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><input type="submit" name="Submit" value="Login"></td>
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</table>
</td>
</form>
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</table>
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<table bgcolor="#dfebf2" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td><table bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="3" width="100%">
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<td><table bgcolor="#f4f9fb" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td width="5%"></td>
<td width="95%">Create file checklogin.php</td>
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<td colspan="2" bgcolor="#eeeeee"></td>
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<td colspan="2" valign="top"><table border="0" cellpadding="0" cellspacing="5" width="100%">
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<td align="center"> </td>
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<td class="Arial"> ############### Code

<?php
$host="localhost"; // Host name
$username=""; // Mysql username
$password=""; // Mysql password
$db_name="test"; // Database name
$tbl_name="members"; // Table name

// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");

// username and password sent from form
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];

// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);

// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){
// Register $myusername, $mypassword and redirect to file "login_success.php"
session_register("myusername");
session_register("mypassword");
header("location:login_success.php");
}
else {
echo "Wrong Username or Password";
}
?>
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<table bgcolor="#dfebf2" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td><table bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="3" width="100%">
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<td><table bgcolor="#f4f9fb" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td width="5%"></td>
<td width="95%">Create file login_success.php </td>
</tr>
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<td colspan="2" bgcolor="#eeeeee"></td>
</tr>
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<td colspan="2" valign="top"><table border="0" cellpadding="0" cellspacing="5" width="100%">
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<td>
############### Code

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

<html>
<body>
Login Successful
</body>
</html></td>
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<table bgcolor="#dfebf2" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td><table bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="3" width="100%">
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<td><table bgcolor="#f4f9fb" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td width="5%"></td>
<td width="95%">Logout.php</td>
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<td colspan="2" bgcolor="#eeeeee"></td>
</tr>
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<td colspan="2" valign="top"><table border="0" cellpadding="0" cellspacing="5" width="100%">
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<td>
If you want to logout, create this file

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


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<table bgcolor="#dfebf2" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td><table bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="3" width="100%">
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<td><table bgcolor="#f4f9fb" border="0" cellpadding="0" cellspacing="1" width="100%">
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<td width="5%"></td>
<td width="95%">For PHP5 User - checklogin.php </td>
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<td colspan="2" bgcolor="#eeeeee"></td>
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<td colspan="2" valign="top"><table border="0" cellpadding="0" cellspacing="5" width="100%">
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<td>############### Code

<?php
ob_start();
$host="localhost"; // Host name
$username=""; // Mysql username
$password=""; // Mysql password
$db_name="test"; // Database name
$tbl_name="members"; // Table name

// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");

// Define $myusername and $mypassword
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];

// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);

// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){
// Register $myusername, $mypassword and redirect to file "login_success.php"
session_register("myusername");
session_register("mypassword");
header("location:login_success.php");
}
else {
echo "Wrong Username or Password";
}
ob_end_flush();
?>



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Encrypting Password - Make your Login More Secure
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Admin|Gana
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