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<?php
namespace SakuraBlog\Models;
use Iterator;
class Model
{
public int $id;
}
abstract class Collection implements Iterator
{
private $position = 0;
private $arr = [];
private $index = [];
function __construct(array $arr)
{
$this->arr = $arr;
foreach ($arr as $i => $v) {
$this->createIndex($v, $i);
}
}
private function createIndex($item, $key)
{
if ($item instanceof Model) {
$this->index[$item->id] = $key;
}
}
function first()
{
return $this->arr[0];
}
function last()
{
var_dump($this->arr);
return $this->arr[$this->count() - 1];
}
function count(): int
{
return count($this->arr);
}
function findByID(int $id)
{
if (isset($this->index[$id]) && isset($this->arr[$this->index[$id]])) {
return $this->arr[$this->index[$id]];
}
return null;
}
function add($item)
{
$this->arr[] = $item;
$key = count($this->arr) - 1;
$this->createIndex($item, $key);
}
function _get($key): mixed
{
return $this->arr[$key];
}
function update($id, $item)
{
if (isset($this->index[$id]) && isset($this->arr[$this->index[$id]])) {
$key = $this->index[$id];
$this->arr[$key] = $item;
}
}
function rewind(): void
{
$this->position = 0;
}
abstract public function current(): mixed;
function _current(): mixed
{
return $this->arr[$this->position];
}
function key(): int
{
return $this->position;
}
function next(): void
{
$this->position++;
}
function valid(): bool
{
return isset($this->arr[$this->position]);
}
}
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