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<?php
namespace Cocur\Chain\Link;
/**
* KeyExists.
*
* @author Florian Eckerstorfer
* @copyright 2015-2018 Florian Eckerstorfer
*/
trait KeyExists
{
* Checks if the given key or index exists in the array.
* Returns `true` if the given `key` is set in the array. `key` can be any value possible for an array index.
* Returns `true` if a key exists with a `null` value.
* @param mixed $key key or index to check
* @return bool `true` if key or index exists in array, `false` otherwise
public function keyExists($key): bool
return array_key_exists($key, $this->array);
}
cocur /
chain
