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<?php
namespace PayPal\Checkout\Concerns;
use PayPal\Checkout\Orders\Item;
trait HasCollection
{
/**
* Determine if an attribute or relation exists on the model.
*
* @param string $key
*
* @return bool
*/
public function __isset(string $key)
{
return $this->offsetExists($key);
}
/**
* Determine if a key exists on the items.
*
* @param string $offset
* @return bool
*/
public function offsetExists(string $offset): bool
{
return isset($this->items[$offset]);
}
/**
* Unset an attribute on the model.
*
* @param string $key
*
* @return void
*/
public function __unset(string $key)
{
$this->offsetUnset($key);
}
/**
* Unset an attribute on the model.
*
* @param string $offset
* @return void
*/
public function offsetUnset(string $offset)
{
unset($this->items[$offset]);
}
/**
* @param mixed $offset
* @param mixed $value
* @return void
*/
public function offsetSet($offset, $value)
{
if (is_null($offset)) {
$this->items[] = $value;
} else {
$this->items[$offset] = $value;
}
}
/**
* @param string $offset
* @return mixed|Item|null
*/
public function offsetGet(string $offset)
{
return $this->items[$offset] ?? null;
}
/**
* Determine if the purchase unit is empty or not.
*
* @return bool
*/
public function isEmpty(): bool
{
return empty($this->items);
}
}