Mastering PHP 7

Generator delegation

Iterating through a list of items is among the most common things in any programming language. PHP makes it easy to iterate over a diverse collection of data using the foreach construct. Many languages differentiate various data types of collection data, such as dictionary, list, set, tuple, and alike. PHP, however, does not dwell that much on data structures and simply uses the array() or [] constructs most of the time for its collections. This, in turn, can have a negative impact on creating large arrays in memory, which could cause exceeding memory limits or even increased processing times.

Aside from the primitive array type, PHP also provides the ArrayObject and ArrayIterator classes. These turn arrays into a first ...