Hi , I get the following error in php code :?

[navin p]

<?php

$var1=2 ;

echo ("the variable is ".gettype($var1)) ;

$var2=settype($var1,boolean) ;


echo ("the variable is ".gettype($var2)) ;

?>

error

the variable is integer
Notice: Use of undefined constant boolean - assumed 'boolean' in I:\wamp\www\phpdatatype.php on line 7
the variable is boolean.

Also if use boolean Typecast i get error for undefined function .
Whats the reason ?