What is the primary purpose of using namespaces in PHP?

The primary purpose of using namespaces in PHP is to help prevent accidentally redefining functions, classes, and constants. Namespaces serve as a way to encapsulate items, making it easier to organize code and avoid name collisions, particularly in larger projects or when integrating multiple libraries.

In environments where various libraries or modules are utilized, the possibility of having functions or classes with the same name increases. Namespaces allow developers to group related code together and use the same names in different contexts without conflict. For example, two libraries might each have a class named User, but by placing them in different namespaces, they can coexist peacefully without any confusion or errors arising from name clashes.

The other choices do not accurately reflect the primary role of namespaces. While they might suggest certain improvements or capabilities, such as file organization, performance enhancement, or increased memory capacity, these are not the fundamental reasons for implementing namespaces in PHP. The core functionality revolves around the management and organization of code, specifically to avoid redefinition issues.