undefine index in simple post method

<form action="forum get.php" method="post">
<input type="text" name="id">
<input type="password" name="pass">
<input type="submit" value="Login">
</form>

<?php
$a=$_POST["id"];
$b=$_POST["pass"];
echo $a.$b;
?>


Here is my simple code, it always echo values but with error "undefine index on 1 and 2 in php code". i have also tried get, request method aswell, but still i get the error.
plz help me out, give me a solution.

 

There's wrong action in the form "forum get.php". for testing you can use something like this:

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
 <input type="text" name="id">
 <input type="password" name="pass">
 <input type="submit" value="Login">
 </form>

 <?php
if ( count($_POST) > 0 )
{
     $a=$_POST["id"];
     $b=$_POST["pass"];
     echo $a.$b;
}
 ?>

Code (markup):

 

Either you give the forum inputs preset values of empty, value="" or check if id & pass are set before you assign them to variables.

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
 <input type="text" name="id" value="">
 <input type="password" name="pass" value="">
 <input type="submit" value="Login">
 </form>

 <?php
$a = $b = '';
if (isset($_POST['id'])) {
     $a=$_POST["id"];
}
if (isset($_POST['pass'])) {
     $b=$_POST["pass"];
}

echo $a.$b;

PHP:

 

The script works as it is however you have your error_reporting on high undefined index is just a warning so yes you can use what Joker-jar and ThePHPMaster have said to get rid of the error or you can just change your error reporting level by using hte error_reporting function http://www.php.net/manual/en/function.error-reporting.php

 

Thanks all of you, it works now