<?php
class Collection implements Countable, IteratorAggregate
{
protected $items = [];
public function __construct($items = [])
{
$this->items = $items;
}
public function __toString()
{
return $this->toJson();
}
public function all()
{
return $this->items;
}
public function first()
{
return isset($this->items[0]) ? $this->items[0] : [];
}
public function last()
{
$results = array_reverse($this->items);
return isset($results[0]) ? $results[0] : [];
}
public function count()
{
return count($this->items);
}
public function each($callback)
{
foreach($this->items as $key => $value)
{
$callback($value, $key);
}
return $this;
}
public function filter($callback = null)
{
if($callback)
{
return new static(array_filter($this->items, $callback));
}
return new static(array_filter($this->items));
}
public function map($callback)
{
$keys = array_keys($this->items);
$items = array_map($callback, $this->items, $keys);
return new static(array_combine($keys, $items));
}
public function toJson()
{
return json_encode($this->items);
}
public function getIterator()
{
return new ArrayIterator($this->items);
}
}
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