Continuing with this series, we’ll get right to business.
Filtering and validation
Filtering and validation are the basics of dealing with user input in the web. We filter data before passing it to the database to prevent attacks (such as SQL Injections) and we validate user input to make sure it is what we expect it to be (hence, valid).
I will be using the Zend_Filter and Zend_Validate components to deal with those two tasks, and combine their usage via the Zend_Filter_Input component. Zend_Filter and Zend_Validate are self explanatory, however I will cover Zend_Filter_Input in brief.