PHP Stream

---

A library to handle Collections like in Java

Stream Class

• public count(): int
• public map(Closure $call): Stream
• public flatMap(Closure $call): Stream
• public filter(Closure $call): Stream
• public notNull(): Stream
• public notEmpty(): Stream
• public each(Closure $call): void
• public toList(bool $keepKeys = false): array
• public toMap(Closure $key, Closure $value): array
• public first(): mixed
• public limit(int $size): Stream
• public order(Comparator $comparator): Stream
• public run(): Stream
• public skip(int $count): Stream
• public implode(string $separator = ','): string
• public join(string $separator = ','): string --> alias for implode
• public batch(int $count): Stream
• public associateBy(Closure $call): array
• public collect(string $class): Collection
• public toGenerator(Closure $call = null, $default = null): Generator
• public callBack(Closure $call): Stream

Streams Class

• public static of(array|Iterator|File|CsvFile $data): Stream
• public static range(int $start, int $inclusiveEnd): Stream
• public static split(string $pattern, string $source): Stream

Examples

$data = [
    (object)["name" => "hallo", "data" => ["a", "b"]],
    (object)["name" => "hallo", "data" => ["a", "b", "H", "g"]],
    (object)["name" => "hallo", "data" => ["a", "b", "d"]],
];

$result = Streams::of($data)
    ->map(fn(object $obj) => (object)["name" => $obj->name, "cnt" => count($obj->data)])
    ->filter(fn(object $obj) => $obj->cnt !== 4)
    ->order(new Comparator(fn(object $a, object $b) => $a->cnt - $b->cnt))
    ->map(fn(object $obj) => "$obj->name - $obj->cnt")
    ->toList();
//Result is
['hallo - 2', 'hallo - 3']

Create a Stream from a Typed Collection

class User { ... }

class UserCollection extends Collection
{
    public function __construct(User ...$data)
    {
        parent::__construct($data);
    }

    public function add(User $value): void 
    {
        parent::addEntry($value);
    }
}   

(new UserCollection(new User("name")))->stream()->map(....)

more Examples in the testsuite.

Running Test

composer verify

or

docker-compose up