Luckily I know php very well. So i've been searching for an app so my friend can start learning it. Unfortunately, I found this app seems to dive in the deep end very quickly and not break things down.
PHP Offline Tutorial App is a PHP Programming Learning From Basics To Advanced
PHP offline tutorial to learn PHP in simple and easy steps with real examples.
Tutorialspoint’s Java Offline Tutorial App is all in one App for Java Learners
PHP 7 Offline Tutorial App from Tutorials Point is an easy-to-use to learn PHP 7