Collection keyBy(callable|string $keyBy) Key an associative array by a field or using a callback. Parameters callable|string $keyBy Return Value Collection

array jsonSerialize() Convert the object into something JSON serializable. Return Value array

bool isEmpty() Determine if the collection is empty or not. Return Value bool

Collection intersect(mixed $items) Intersect the collection with the given items. Parameters mixed $items Return Value Collection

string implode(string $value, string $glue = null) Concatenate values of a given key as a string. Parameters string $value string $glue Return Value string

static bool hasMacro(string $name) Checks if macro is registered. Parameters string $name Return Value bool

bool has(mixed $key) Determine if an item exists in the collection by key. Parameters mixed $key Return Value bool

Collection groupBy(callable|string $groupBy, bool $preserveKeys = false) Group an associative array by a field or using a callback. Parameters callable|string $groupBy bool $preserveKeys Return Value Collection

ArrayIterator getIterator() Get an iterator for the items. Return Value ArrayIterator

CachingIterator getCachingIterator(int $flags = CachingIterator::CALL_TOSTRING) Get a CachingIterator instance. Parameters int $flags Return Value CachingIterator