printing only certain information from the table using php

i need help printing only certain rows from within a table.. for instance, if my table looks like this :
+-------------------+----------------+----------------------+
| Description | Heading | Link |
+-------------------+----------------+----------------------+
| Google | Heading 4 | www.google.com |
| Toms Hardware | Heading 3 | www.tomshardware.com |
| Anandtech | Heading 2 | www.anandtech.com |
| check this out | Heading 1 | www.henryadams.com |
| another heading 4 | Heading 4 | www.heading4.com |
| test | Heading 3 | www.test3.com |
| heading 4 agagin | Heading 4 | laksjdf;alkf |
| new heading test | newHeadingTest | www.newheadingtest |
+-------------------+----------------+----------------------+

and i want to only print out the results for "Heading 4" under the "Heading" column, and only have the results print out once, using php.. how would i do this?

The Headings are inputed by the user through a web interface i created where the user may either select an exisiting heading or type in a completely new one that has nothing to do with any of the others.

thanks for any and all of your help..

It's called a WHERE clause in a SQL statement.