There are numerous education and learning applications that can be built using PHP. Here are a few examples:

1. Learning Management System (LMS): An LMS is a platform that allows educators to create online courses, manage student enrollments, and track student progress. With PHP, you can create an LMS that includes features such as course creation and management, student enrollment and progress tracking, discussion forums, quizzes and assessments, and more.

2. Online Tutoring Platform: PHP can be used to build an online tutoring platform that connects students with tutors for one-on-one remote learning sessions. The platform can include features such as tutor profiles, appointment scheduling, video conferencing, and payment processing.

3. Language Learning App: PHP can be used to create a language learning app that helps users learn a new language through interactive lessons, quizzes, and exercises. The app can track the user’s progress and adapt the content based on their proficiency level.

4. Flashcard App: PHP can be used to create a flashcard app that allows users to create custom flashcards for studying purposes. The app can include features such as card creation and management, spaced repetition algorithms, and progress tracking.

5. Online Exam Platform: PHP can be used to build an online exam platform that enables educators to create and administer quizzes and exams. The platform can handle features such as question creation, exam scheduling, secure test taking, and automatic grading.

6. Virtual Classroom: PHP can be used to create a virtual classroom platform that enables educators to deliver live lectures, interact with students through chat or video conferencing, and share learning materials. The platform can include features such as screen sharing, breakout rooms for group discussions, and attendance tracking.

7. Course Recommendation System: PHP can be used to build a course recommendation system that suggests relevant courses to users based on their interests, previous learning history, and preferences.

These are just a few examples of education and learning applications that can be built using PHP. The possibilities are endless, and PHP provides a flexible and robust foundation for building these types of applications.