The Rock Twilio with PHP This Week contest encourages developers to submit their Twilio applications built using PHP. The contest aims to promote the use of PHP for building Twilio apps, and it also invites submissions from previous weeks that didn't win or were coded in other languages like Ruby or Python. The contest provides example code in PHP to help get started with popular features such as click-to-call, call screening, phone menus, voice broadcasts, company directories, voicemails, and transcription services. Submissions are due by August 9th, and the winner will be announced on August 10th. The contest also promotes Twilio's developer community hub, Ahoy, which offers best practices, code samples, and inspiration for building communications and digital engagement experiences.