smart card and PHP

is it posibble to write a program with PHP to communicate with smart card reader??

Well not directly.
Assuming that one doesn't exsist already, you would have to write an extension to PHP in C. Providing an API for the smartcard reader. Which could then be used to control the smartcard reader from PHP.

Here's the documentation for writing extensions to PHP.
http://www.php.net/manual/en/zend.creating.php