Acknowledgments Introduction PART I: LANGUAGE FUNDAMENTALS Chapter 1: PHP Program Basics Chapter 2: Data Types Chapter 3: Strings and String Functions Chapter 4: Making Choices with Conditionals Chapter 5: Creating Reusable Code with Functions PART II: WORKING WITH DATA Chapter 6: Repeating Actions with Loops Chapter 7: Simple Arrays Chapter 8: Sophisticated Arrays Chapter 9: Working with Files and Directories PART III: PROGRAMMING WEB APPLICATIONS Chapter 10: Client-Server Communication and Web Development Basics Chapter 11: Creating and Processing Web Forms Chapter 12: Validating Form Data Chapter 13: Organizing a Web Application PART IV: STORING USER DATA WITH BROWSER SESSIONS Chapter 14: Working with Sessions Chapter 15: Implementing a Shopping Cart Chapter 16: Authentication and Authorization PART V: OBJECT-ORIENTED PHP Chapter 17: Introduction to Object-Oriented Programming Chapter 18: Declaring Classes and Creating Objects Chapter 19: Inheritance Chapter 20: Managing Classes and Namespaces with Composer Chapter 21: Efficient Template Design with Twig Chapter 22: Structuring an Object-Oriented Web Application Chapter 23: Error Handling with Exceptions Chapter 24: Logging Events, Messages, and Transactions Chapter 25: Static Methods, Properties, and Enumerations Chapter 26: Abstract Methods, Interfaces, and Traits PART VI: DATABASE-DRIVEN APPLICATION DEVELOPMENT Chapter 27: Introduction to Databases Chapter 28: Database Programming with the PDO Library Chapter 29: Programming CRUD Operations Chapter 30: ORM Libraries and Database Security Chapter 31: Working with Dates and Times Appendix A: Installing PHP Appendix B: Database Setup Appendix C: Replit Configuration.