How to implement a SPAM control countermeasure that remains accessible ... From Web Services Wiki Problem You want to implement a SPAM control countermeasure in PHP that does not rely on CAPTCHAs, which often inconvenience and alienate legitimate users. Solution SWAT provides a class called StanfordForm which can help prevent different types of spambots from abusing your forms. This class includes a basic general error handling mechanism and automatic decision-making for ease of use. GOCR. Quantum Random Bit Generator Service.