How to parse and process HTML with PHP?
http://stackoverflow.com/questions/3577641/how-to-parse-and-process-html-with-php
Reference - What does this symbol mean in PHP?
http://stackoverflow.com/questions/3737139/reference-what-does-this-symbol-mean-in-php
Headers already sent by PHP
http://stackoverflow.com/questions/8028957/headers-already-sent-by-php
Best way to prevent SQL Injection in PHP
http://stackoverflow.com/questions/60174/best-way-to-prevent-sql-injection-in-php