Almost 20 years ago, I used the book 'Teach yourself PHP and MySQL in 24 hours' learn PHP so I could build a web application for a VoIP telephony service. I bui

Almost 20 years ago, I used the book 'Teach yourself PHP and MySQL in 24 hours' learn PHP so I could build a web application for a VoIP telephony service. I built the whole v1 in that 24 hours, and then went to sleep. I had never used PHP or MySQL before.