기존 자료구조인 SPL 구현 잘못되서 ArrayObject , SplFixedArray  < - 끔찍

새로 만들어서 8.1에 넣으려니까 익스텐션들 전역설정가능해서 네임스페이스 없어서 이름충돌함


8.2에서 그거 해결하고 9.0에 넣으려고 그럼


array_filter($배열, 함수)  함수따로 안쓰고


$map->filter(fn($x) => []);   이런식으로 다른언어들처럼 함수형으로하려고함



// 아래는 RFC로 제안하는 대략적인 인터페이스

https://wiki.php.net/rfc/vector

namespace Collections;

final class Vector implements IteratorAggregate, Countable, JsonSerializable, ArrayAccess
{
 /**
 * Construct a Vector from an iterable.
 *
 * When $preserveKeys is false, the values will be reindexed without gaps starting from 0
 * When $preserveKeys is true, any gaps in the keys of the iterable will be filled in with null,
 * and negative indices or non-integer indices will be rejected and cause an Exception.
 */
 public function __construct(iterable $iterator = [], bool $preserveKeys = true) {}
 public function getIterator(): InternalIterator {}
 public function count(): int {}
 public function capacity(): int {}
 public function shrinkToFit(): void {}
 public function clear(): void {}
 public function setSize(int $size): void {}

 public function __serialize(): array {}
 public function __unserialize(array $data): void {}
 public static function __set_state(array $array): Vector {}

 public function push(mixed $value): void {}
 public function pop(): mixed {}

 public function toArray(): array {}
 // Strictly typed, unlike offsetGet/offsetSet
 public function valueAt(int $offset): mixed {}
 public function setValueAt(int $offset, mixed $value): void {}

 public function offsetGet(mixed $offset): mixed {}
 public function offsetExists(mixed $offset): bool {}
 public function offsetSet(mixed $offset, mixed $value): void {}
 // Throws because unset and null are different things, unlike SplFixedArray
 public function offsetUnset(mixed $offset): void {}

 public function indexOf(mixed $value): int|false {}
 public function contains(mixed $value): bool {}

 public function map(callable $callback): Vector {}