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Informations about the package collection
[!WARNING] [Archived] Since the arrival of PHP pipe operators, use a true pipe-native approach with a library such as: https://github.com/stannapp/stream-php
Collection
Collection provides a powerful data manipulation system based on the map/reduce/filter principles. Thanks to the php generators and the immutability, it allows to calculate the data as late as possible while preserving the memory.
Installation
How to use
Exemple :
Basic operations
- map(callable): Collection
- filter(callable): Collection
- reduce(callable, initial): mixed
- flatten(): Collection
- flatMap(callable): Collection
- sort(callable = null): Collection
- sum(): int|float
- avg(): int|float
- unique(): Collection
- count(): int
- first(): mixed
- each(): Collection
- groupBy(callable): CollectionGroup
Note : As long as you use map/filter operations, nothing will be executed or stored
in memory. If you decide to do more than one reduce or iterate operation, use get()
first to before to buffer the previous operations.
Map
The map() function iterates over each element and applies the transformation function provided by the user.
Example :
Filter
The filter() method test elements using that pass the test implemented by the provided function.
Example :
Reduce
The reduce() method executes a reduction function provided by the user on each element, the result of each iteration is passed to the next iteration.
Example :
GroupBy
The method groupBy() returns a Collection of CollectionGroup.
A CollectionGroup is a simple collection with a key property added.
Example :
