It is important to following coding conventions of any software you are working with. Coding conventions should be treated like coding guidelines. This helps in make the code more readable.

• use camel case
• class name begin with Zend_ if it is part of Zend Framework itself
• declare variable as public, private, protected instead of using var
• do not use short form
• do not use call-time pass-by-reference
• no preceding or trailing spaces