Summary  
This chapter covers how to use loops to traverse data collections and accumulate summary statistics (such as counts, sums, and averages) using accumulator variables and conditional logic.  

General domain of usage  
Data analysis

Master the art of iteration in PHP! This course takes you from the basics of for, while, and foreach loops to advanced data processing and real-world challenges. Learn to count, filter, accumulate, and transform data with confidence, and discover how to write efficient, readable, and powerful loop-based code.

Explore the core PHP loop constructs and learn how to use them for counting, filtering, accumulation, and more. Build a strong foundation for all your future PHP projects.

Master the foreach loop by working with associative arrays, transforming data, and iterating over real-world datasets.

Learn to use loops for generating reports, tables, and summaries, and discover grouping and aggregation techniques without built-in helpers.

Summarizing Data with Loops

Summarizing Data with Loops