Could you please help me, how to print a MySQL table to printer? I need PHP script about it. Thanks.

PHP CANNOT send ANYTHING to clientside devices such as printers.

Output the data to a page and include some javascript to send the page to print after loading.

you have to user javascript print method , you can not user php , php runs on the server not in the client's machine

example
<a href="whatever.htm" onClick="window.print();return false"><img src="print.gif"></a>

Grab all the details from the database and put it in a table and then use a javascript to print the values. Simple