Php tutorial generators and iterators quick guide

php provides powerful tools for managing data collections through generators and iterators, enhancing code efficiency and readability. generators are a special type of function that simplify the creation of iterators. instead of returning all results at once, they yield values one at a time, which is especially useful for handling large datasets or streams of data, as it reduces memory consumption.

iterators, on the other hand, are objects that implement the iterator interface, allowing traversal of collections without exposing their underlying structure. they provide methods like `current()`, `key()`, `next()`, and `rewind()` to navigate through elements systematically.

using generators and iterators promotes cleaner code by encapsulating iteration logic, allowing developers to focus on the core functionality. they also facilitate lazy evaluation, improving performance in scenarios where not all data needs to be loaded at once. together, these features significantly enhance php's capabilities for handling collections and iterative processes.
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