PHP Code to Log IP Address

<?php

include("config.php");
session_start();
if($_SERVER["REQUEST_METHOD"] == "POST")
{

// username and password sent from Form 

$myusername=addslashes($_POST['username']); 
$mypassword=addslashes($_POST['password']); 

$sql="SELECT id FROM admin WHERE username='$myusername' and passcode='$mypassword'";
$result=mysql_query($sql);
$row=mysql_fetch_array($result);
$active=$row['active'];
$count=mysql_num_rows($result);

// If result matched $myusername and $mypassword, table row must be 1 row

if($count==1)
{
session_register("myusername");
$_SESSION['login_user']=$myusername;

header("location: welcome.php");
}
else 
{
$error="Your Login Name or Password is invalid";
}
}

?>

<form action="" method="post">
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<center> <h2>Eastern District</h2></center>
<center> <h2> Human Resource Employment Tracking System </h2> </center>
<br>
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<center><label><b>USER NAME :</b></label>

<input type="text" name="username"/><br />

<label><b>PASSWORD :</b></label>

<input type="password" name="password"/><br/>
<br>

<input type="submit" value=" Login "/><br />
</center>
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<center> <b> *** The IP address of your computer has already been logged *** </center>
<center> *** All unsuccessful & successful attempts to log onto this system is recorded *** </b> </center>

</form>

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