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<?php namespace Ds\Traits; /** * Common to structures that implement the base collection interface. */ trait GenericCollection { /** * Returns whether the collection is empty. * * This should be equivalent to a count of zero, but is not required. * Implementations should define what empty means in their own context. * * @return bool whether the collection is empty. */ public function isEmpty(): bool { return count($this) === 0; } /** * Returns a representation that can be natively converted to JSON, which is * called when invoking json_encode. * * @return mixed * * @see \JsonSerializable */ #[\ReturnTypeWillChange] public function jsonSerialize() { return $this->toArray(); } /** * Creates a shallow copy of the collection. * * @return static a shallow copy of the collection. */ public function copy(): self { return new static($this); } /** * Returns an array representation of the collection. * * The format of the returned array is implementation-dependent. Some * implementations may throw an exception if an array representation * could not be created (for example when object are used as keys). * * @return array */ abstract public function toArray(): array; /** * Invoked when calling var_dump. * * @return array */ public function __debugInfo() { return $this->toArray(); } /** * Returns a string representation of the collection, which is invoked when * the collection is converted to a string. */ public function __toString() { return 'object(' . get_class($this) . ')'; } }
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