Strong cryptography is the usage of systems or components that are considered highly resistant to cryptanalysis, the study of methods to cracking the codes. In this talk I would like to present the usage of strong cryptography in PHP. Security is a very important aspect of web applications especially when they manipulate data like passwords, credit card numbers, or sensitive data (as health, financial activities, sexual behavior or sexual orientation, social security numbers, etc). In particular I will present the extensions mcrypt, Hash, and OpenSSL that are been improved in the last version of PHP. These are the slides presented during my talk at PHP Dutch Conference 2011.