<?php
namespace Illuminate\Support;
use ArrayAccess;
use ArrayIterator;
use Illuminate\Collections\ItemNotFoundException;
use Illuminate\Collections\MultipleItemsFoundException;
use Illuminate\Support\Traits\EnumeratesValues;
use Illuminate\Support\Traits\Macroable;
use stdClass;
class Collection implements ArrayAccess, Enumerable
{
use EnumeratesValues, Macroable;
/**
* The items contained in the collection.
*
* @var array
*/
protected $items = [];
/**
* Create a new collection.
*
* @param mixed $items
* @return void
*/
public function __construct($items = [])
{
$this->items = $this->getArrayableItems($items);
}
/**
* Create a collection with the given range.
*
* @param int $from
* @param int $to
* @return static
*/
public static function range($from, $to)
{
return new static(range($from, $to));
}
/**
* Get all of the items in the collection.
*
* @return array
*/
public function all()
{
return $this->items;
}
/**
* Get a lazy collection for the items in this collection.
*
* @return \Illuminate\Support\LazyCollection
*/
public function lazy()
{
return new LazyCollection($this->items);
}
/**
* Get the average value of a given key.
*
* @param callable|string|null $callback
* @return mixed
*/
public function avg($callback = null)
{
$callback = $this->valueRetriever($callback);
$items = $this->map(function ($value) use ($callback) {
return $callback($value);
})->filter(function ($value) {
return ! is_null($value);
});
if ($count = $items->count()) {
return $items->sum() / $count;
}
}
/**
* Get the median of a given key.
*
* @param string|array|null $key
* @return mixed
*/
public function median($key = null)
{
$values = (isset($key) ? $this->pluck($key) : $this)
->filter(function ($item) {
return ! is_null($item);
})->sort()->values();
$count = $values->count();
if ($count === 0) {
return;
}
$middle = (int) ($count / 2);
if ($count % 2) {
return $values->get($middle);
}
return (new static([
$values->get($middle - 1), $values->get($middle),
]))->average();
}
/**
* Get the mode of a given key.
*
* @param string|array|null $key
* @return array|null
*/
public function mode($key = null)
{
if ($this->count() === 0) {
return;
}
$collection = isset($key) ? $this->pluck($key) : $this;
$counts = new static;
$collection->each(function ($value) use ($counts) {
$counts[$value] = isset($counts[$value]) ? $counts[$value] + 1 : 1;
});
$sorted = $counts->sort();
$highestValue = $sorted->last();
return $sorted->filter(function ($value) use ($highestValue) {
return $value == $highestValue;
})->sort()->keys()->all();
}
/**
* Collapse the collection of items into a single array.
*
* @return static
*/
public function collapse()
{
return new static(Arr::collapse($this->items));
}
/**
* Determine if an item exists in the collection.
*
* @param mixed $key
* @param mixed $operator
* @param mixed $value
* @return bool
*/
public function contains($key, $operator = null, $value = null)
{
if (func_num_args() === 1) {
if ($this->useAsCallable($key)) {
$placeholder = new stdClass;
return $this->first($key, $placeholder) !== $placeholder;
}
return in_array($key, $this->items);
}
return $this->contains($this->operatorForWhere(...func_get_args()));
}
/**
* Cross join with the given lists, returning all possible permutations.
*
* @param mixed ...$lists
* @return static
*/
public function crossJoin(...$lists)
{
return new static(Arr::crossJoin(
$this->items, ...array_map([$this, 'getArrayableItems'], $lists)
));
}
/**
* Get the items in the collection that are not present in the given items.
*
* @param mixed $items
* @return static
*/
public function diff($items)
{
return new static(array_diff($this->items, $this->getArrayableItems($items)));
}
/**
* Get the items in the collection that are not present in the given items, using the callback.
*
* @param mixed $items
* @param callable $callback
* @return static
*/
public function diffUsing($items, callable $callback)
{
return new static(array_udiff($this->items, $this->getArrayableItems($items), $callback));
}
/**
* Get the items in the collection whose keys and values are not present in the given items.
*
* @param mixed $items
* @return static
*/
public function diffAssoc($items)
{
return new static(array_diff_assoc($this->items, $this->getArrayableItems($items)));
}
/**
* Get the items in the collection whose keys and values are not present in the given items, using the callback.
*
* @param mixed $items
* @param callable $callback
* @return static
*/
public function diffAssocUsing($items, callable $callback)
{
return new static(array_diff_uassoc($this->items, $this->getArrayableItems($items), $callback));
}
/**
* Get the items in the collection whose keys are not present in the given items.
*
* @param mixed $items
* @return static
*/
public function diffKeys($items)
{
return new static(array_diff_key($this->items, $this->getArrayableItems($items)));
}
/**
* Get the items in the collection whose keys are not present in the given items, using the callback.
*
* @param mixed $items
* @param callable $callback
* @return static
*/
public function diffKeysUsing($items, callable $callback)
{
return new static(array_diff_ukey($this->items, $this->getArrayableItems($items), $callback));
}
/**
* Retrieve duplicate items from the collection.
*
* @param callable|string|null $callback
* @param bool $strict
* @return static
*/
public function duplicates($callback = null, $strict = false)
{
$items = $this->map($this->valueRetriever($callback));
$uniqueItems = $items->unique(null, $strict);
$compare = $this->duplicateComparator($strict);
$duplicates = new static;
foreach ($items as $key => $value) {
if ($uniqueItems->isNotEmpty() && $compare($value, $uniqueItems->first())) {
$uniqueItems->shift();
} else {
$duplicates[$key] = $value;
}
}
return $duplicates;
}
/**
* Retrieve duplicate items from the collection using strict comparison.
*
* @param callable|string|null $callback
* @return static
*/
public function duplicatesStrict($callback = null)
{
return $this->duplicates($callback, true);
}
/**
* Get the comparison function to detect duplicates.
*
* @param bool $strict
* @return \Closure
*/
protected function duplicateComparator($strict)
{
if ($strict) {
return function ($a, $b) {
return $a === $b;
};
}
return function ($a, $b) {
return $a == $b;
};
}
/**
* Get all items except for those with the specified keys.
*
* @param \Illuminate\Support\Collection|mixed $keys
* @return static
*/
public function except($keys)
{
if ($keys instanceof Enumerable) {
$keys = $keys->all();
} elseif (! is_array($keys)) {
$keys = func_get_args();
}
return new static(Arr::except($this->items, $keys));
}
/**
* Run a filter over each of the items.
*
* @param callable|null $callback
* @return static
*/
public function filter(callable $callback = null)
{
if ($callback) {
return new static(Arr::where($this->items, $callback));
}
return new static(array_filter($this->items));
}
/**
* Get the first item from the collection passing the given truth test.
*
* @param callable|null $callback
* @param mixed $default
* @return mixed
*/
public function first(callable $callback = null, $default = null)
{
return Arr::first($this->items, $callback, $default);
}
/**
* Get a flattened array of the items in the collection.
*
* @param int $depth
* @return static
*/
public function flatten($depth = INF)
{
return new static(Arr::flatten($this->items, $depth));
}
/**
* Flip the items in the collection.
*
* @return static
*/
public function flip()
{
return new static(array_flip($this->items));
}
/**
* Remove an item from the collection by key.
*
* @param string|array $keys
* @return $this
*/
public function forget($keys)
{
foreach ((array) $keys as $key) {
$this->offsetUnset($key);
}
return $this;
}
/**
* Get an item from the collection by key.
*
* @param mixed $key
* @param mixed $default
* @return mixed
*/
public function get($key, $default = null)
{
if (array_key_exists($key, $this->items)) {
return $this->items[$key];
}
return value($default);
}
/**
* Group an associative array by a field or using a callback.
*
* @param array|callable|string $groupBy
* @param bool $preserveKeys
* @return static
*/
public function groupBy($groupBy, $preserveKeys = false)
{
if (! $this->useAsCallable($groupBy) && is_array($groupBy)) {
$nextGroups = $groupBy;
$groupBy = array_shift($nextGroups);
}
$groupBy = $this->valueRetriever($groupBy);
$results = [];
foreach ($this->items as $key => $value) {
$groupKeys = $groupBy($value, $key);
if (! is_array($groupKeys)) {
$groupKeys = [$groupKeys];
}
foreach ($groupKeys as $groupKey) {
$groupKey = is_bool($groupKey) ? (int) $groupKey : $groupKey;
if (! array_key_exists($groupKey, $results)) {
$results[$groupKey] = new static;
}
$results[$groupKey]->offsetSet($preserveKeys ? $key : null, $value);
}
}
$result = new static($results);
if (! empty($nextGroups)) {
return $result->map->groupBy($nextGroups, $preserveKeys);
}
return $result;
}
/**
* Key an associative array by a field or using a callback.
*
* @param callable|string $keyBy
* @return static
*/
public function keyBy($keyBy)
{
$keyBy = $this->valueRetriever($keyBy);
$results = [];
foreach ($this->items as $key => $item) {
$resolvedKey = $keyBy($item, $key);
if (is_object($resolvedKey)) {
$resolvedKey = (string) $resolvedKey;
}
$results[$resolvedKey] = $item;
}
return new static($results);
}
/**
* Determine if an item exists in the collection by key.
*
* @param mixed $key
* @return bool
*/
public function has($key)
{
$keys = is_array($key) ? $key : func_get_args();
foreach ($keys as $value) {
if (! array_key_exists($value, $this->items)) {
return false;
}
}
return true;
}
/**
* Concatenate values of a given key as a string.
*
* @param string $value
* @param string|null $glue
* @return string
*/
public function implode($value, $glue = null)
{
$first = $this->first();
if (is_array($first) || (is_object($first) && ! $first instanceof Stringable)) {
return implode($glue ?? '', $this->pluck($value)->all());
}
return implode($value ?? '', $this->items);
}
/**
* Intersect the collection with the given items.
*
* @param mixed $items
* @return static
*/
public function intersect($items)
{
return new static(array_intersect($this->items, $this->getArrayableItems($items)));
}
/**
* Intersect the collection with the given items by key.
*
* @param mixed $items
* @return static
*/
public function intersectByKeys($items)
{
return new static(array_intersect_key(
$this->items, $this->getArrayableItems($items)
));
}
/**
* Determine if the collection is empty or not.
*
* @return bool
*/
public function isEmpty()
{
return empty($this->items);
}
/**
* Determine if the collection contains a single item.
*
* @return bool
*/
public function containsOneItem()
{
return $this->count() === 1;
}
/**
* Join all items from the collection using a string. The final items can use a separate glue string.
*
* @param string $glue
* @param string $finalGlue
* @return string
*/
public function join($glue, $finalGlue = '')
{
if ($finalGlue === '') {
return $this->implode($glue);
}
$count = $this->count();
if ($count === 0) {
return '';
}
if ($count === 1) {
return $this->last();
}
$collection = new static($this->items);
$finalItem = $collection->pop();
return $collection->implode($glue).$finalGlue.$finalItem;
}
/**
* Get the keys of the collection items.
*
* @return static
*/
public function keys()
{
return new static(array_keys($this->items));
}
/**
* Get the last item from the collection.
*
* @param callable|null $callback
* @param mixed $default
* @return mixed
*/
public function last(callable $callback = null, $default = null)
{
return Arr::last($this->items, $callback, $default);
}
/**
* Get the values of a given key.
*
* @param string|array|int|null $value
* @param string|null $key
* @return static
*/
public function pluck($value, $key = null)
{
return new static(Arr::pluck($this->items, $value, $key));
}
/**
* Run a map over each of the items.
*
* @param callable $callback
* @return static
*/
public function map(callable $callback)
{
$keys = array_keys($this->items);
$items = array_map($callback, $this->items, $keys);
return new static(array_combine($keys, $items));
}
/**
* Run a dictionary map over the items.
*
* The callback should return an associative array with a single key/value pair.
*
* @param callable $callback
* @return static
*/
public function mapToDictionary(callable $callback)
{
$dictionary = [];
foreach ($this->items as $key => $item) {
$pair = $callback($item, $key);
$key = key($pair);
$value = reset($pair);
if (! isset($dictionary[$key])) {
$dictionary[$key] = [];
}
$dictionary[$key][] = $value;
}
return new static($dictionary);
}
/**
* Run an associative map over each of the items.
*
* The callback should return an associative array with a single key/value pair.
*
* @param callable $callback
* @return static
*/
public function mapWithKeys(callable $callback)
{
$result = [];
foreach ($this->items as $key => $value) {
$assoc = $callback($value, $key);
foreach ($assoc as $mapKey => $mapValue) {
$result[$mapKey] = $mapValue;
}
}
return new static($result);
}
/**
* Merge the collection with the given items.
*
* @param mixed $items
* @return static
*/
public function merge($items)
{
return new static(array_merge($this->items, $this->getArrayableItems($items)));
}
/**
* Recursively merge the collection with the given items.
*
* @param mixed $items
* @return static
*/
public function mergeRecursive($items)
{
return new static(array_merge_recursive($this->items, $this->getArrayableItems($items)));
}
/**
* Create a collection by using this collection for keys and another for its values.
*
* @param mixed $values
* @return static
*/
public function combine($values)
{
return new static(array_combine($this->all(), $this->getArrayableItems($values)));
}
/**
* Union the collection with the given items.
*
* @param mixed $items
* @return static
*/
public function union($items)
{
return new static($this->items + $this->getArrayableItems($items));
}
/**
* Create a new collection consisting of every n-th element.
*
* @param int $step
* @param int $offset
* @return static
*/
public function nth($step, $offset = 0)
{
$new = [];
$position = 0;
foreach ($this->items as $item) {
if ($position % $step === $offset) {
$new[] = $item;
}
$position++;
}
return new static($new);
}
/**
* Get the items with the specified keys.
*
* @param mixed $keys
* @return static
*/
public function only($keys)
{
if (is_null($keys)) {
return new static($this->items);
}
if ($keys instanceof Enumerable) {
$keys = $keys->all();
}
$keys = is_array($keys) ? $keys : func_get_args();
return new static(Arr::only($this->items, $keys));
}
/**
* Get and remove the last item from the collection.
*
* @return mixed
*/
public function pop()
{
return array_pop($this->items);
}
/**
* Push an item onto the beginning of the collection.
*
* @param mixed $value
* @param mixed $key
* @return $this
*/
public function prepend($value, $key = null)
{
$this->items = Arr::prepend($this->items, ...func_get_args());
return $this;
}
/**
* Push one or more items onto the end of the collection.
*
* @param mixed $values [optional]
* @return $this
*/
public function push(...$values)
{
foreach ($values as $value) {
$this->items[] = $value;
}
return $this;
}
/**
* Push all of the given items onto the collection.
*
* @param iterable $source
* @return static
*/
public function concat($source)
{
$result = new static($this);
foreach ($source as $item) {
$result->push($item);
}
return $result;
}
/**
* Get and remove an item from the collection.
*
* @param mixed $key
* @param mixed $default
* @return mixed
*/
public function pull($key, $default = null)
{
return Arr::pull($this->items, $key, $default);
}
/**
* Put an item in the collection by key.
*
* @param mixed $key
* @param mixed $value
* @return $this
*/
public function put($key, $value)
{
$this->offsetSet($key, $value);
return $this;
}
/**
* Get one or a specified number of items randomly from the collection.
*
* @param int|null $number
* @return static|mixed
*
* @throws \InvalidArgumentException
*/
public function random($number = null)
{
if (is_null($number)) {
return Arr::random($this->items);
}
return new static(Arr::random($this->items, $number));
}
/**
* Replace the collection items with the given items.
*
* @param mixed $items
* @return static
*/
public function replace($items)
{
return new static(array_replace($this->items, $this->getArrayableItems($items)));
}
/**
* Recursively replace the collection items with the given items.
*
* @param mixed $items
* @return static
*/
public function replaceRecursive($items)
{
return new static(array_replace_recursive($this->items, $this->getArrayableItems($items)));
}
/**
* Reverse items order.
*
* @return static
*/
public function reverse()
{
return new static(array_reverse($this->items, true));
}
/**
* Search the collection for a given value and return the corresponding key if successful.
*
* @param mixed $value
* @param bool $strict
* @return mixed
*/
public function search($value, $strict = false)
{
if (! $this->useAsCallable($value)) {
return array_search($value, $this->items, $strict);
}
foreach ($this->items as $key => $item) {
if ($value($item, $key)) {
return $key;
}
}
return false;
}
/**
* Get and remove the first item from the collection.
*
* @return mixed
*/
public function shift()
{
return array_shift($this->items);
}
/**
* Shuffle the items in the collection.
*
* @param int|null $seed
* @return static
*/
public function shuffle($seed = null)
{
return new static(Arr::shuffle($this->items, $seed));
}
/**
* Create chunks representing a "sliding window" view of the items in the collection.
*
* @param int $size
* @param int $step
* @return static
*/
public function sliding($size = 2, $step = 1)
{
$chunks = floor(($this->count() - $size) / $step) + 1;
return static::times($chunks, function ($number) use ($size, $step) {
return $this->slice(($number - 1) * $step, $size);
});
}
/**
* Skip the first {$count} items.
*
* @param int $count
* @return static
*/
public function skip($count)
{
return $this->slice($count);
}
/**
* Skip items in the collection until the given condition is met.
*
* @param mixed $value
* @return static
*/
public function skipUntil($value)
{
return new static($this->lazy()->skipUntil($value)->all());
}
/**
* Skip items in the collection while the given condition is met.
*
* @param mixed $value
* @return static
*/
public function skipWhile($value)
{
return new static($this->lazy()->skipWhile($value)->all());
}
/**
* Slice the underlying collection array.
*
* @param int $offset
* @param int|null $length
* @return static
*/
public function slice($offset, $length = null)
{
return new static(array_slice($this->items, $offset, $length, true));
}
/**
* Split a collection into a certain number of groups.
*
* @param int $numberOfGroups
* @return static
*/
public function split($numberOfGroups)
{
if ($this->isEmpty()) {
return new static;
}
$groups = new static;
$groupSize = floor($this->count() / $numberOfGroups);
$remain = $this->count() % $numberOfGroups;
$start = 0;
for ($i = 0; $i < $numberOfGroups; $i++) {
$size = $groupSize;
if ($i < $remain) {
$size++;
}
if ($size) {
$groups->push(new static(array_slice($this->items, $start, $size)));
$start += $size;
}
}
return $groups;
}
/**
* Split a collection into a certain number of groups, and fill the first groups completely.
*
* @param int $numberOfGroups
* @return static
*/
public function splitIn($numberOfGroups)
{
return $this->chunk(ceil($this->count() / $numberOfGroups));
}
/**
* Get the first item in the collection, but only if exactly one item exists. Otherwise, throw an exception.
*
* @param mixed $key
* @param mixed $operator
* @param mixed $value
* @return mixed
*
* @throws \Illuminate\Collections\ItemNotFoundException
* @throws \Illuminate\Collections\MultipleItemsFoundException
*/
public function sole($key = null, $operator = null, $value = null)
{
$filter = func_num_args() > 1
? $this->operatorForWhere(...func_get_args())
: $key;
$items = $this->when($filter)->filter($filter);
if ($items->isEmpty()) {
throw new ItemNotFoundException;
}
if ($items->count() > 1) {
throw new MultipleItemsFoundException;
}
return $items->first();
}
/**
* Chunk the collection into chunks of the given size.
*
* @param int $size
* @return static
*/
public function chunk($size)
{
if ($size <= 0) {
return new static;
}
$chunks = [];
foreach (array_chunk($this->items, $size, true) as $chunk) {
$chunks[] = new static($chunk);
}
return new static($chunks);
}
/**
* Chunk the collection into chunks with a callback.
*
* @param callable $callback
* @return static
*/
public function chunkWhile(callable $callback)
{
return new static(
$this->lazy()->chunkWhile($callback)->mapInto(static::class)
);
}
/**
* Sort through each item with a callback.
*
* @param callable|int|null $callback
* @return static
*/
public function sort($callback = null)
{
$items = $this->items;
$callback && is_callable($callback)
? uasort($items, $callback)
: asort($items, $callback ?? SORT_REGULAR);
return new static($items);
}
/**
* Sort items in descending order.
*
* @param int $options
* @return static
*/
public function sortDesc($options = SORT_REGULAR)
{
$items = $this->items;
arsort($items, $options);
return new static($items);
}
/**
* Sort the collection using the given callback.
*
* @param callable|array|string $callback
* @param int $options
* @param bool $descending
* @return static
*/
public function sortBy($callback, $options = SORT_REGULAR, $descending = false)
{
if (is_array($callback) && ! is_callable($callback)) {
return $this->sortByMany($callback);
}
$results = [];
$callback = $this->valueRetriever($callback);
// First we will loop through the items and get the comparator from a callback
// function which we were given. Then, we will sort the returned values and
// and grab the corresponding values for the sorted keys from this array.
foreach ($this->items as $key => $value) {
$results[$key] = $callback($value, $key);
}
$descending ? arsort($results, $options)
: asort($results, $options);
// Once we have sorted all of the keys in the array, we will loop through them
// and grab the corresponding model so we can set the underlying items list
// to the sorted version. Then we'll just return the collection instance.
foreach (array_keys($results) as $key) {
$results[$key] = $this->items[$key];
}
return new static($results);
}
/**
* Sort the collection using multiple comparisons.
*
* @param array $comparisons
* @return static
*/
protected function sortByMany(array $comparisons = [])
{
$items = $this->items;
usort($items, function ($a, $b) use ($comparisons) {
foreach ($comparisons as $comparison) {
$comparison = Arr::wrap($comparison);
$prop = $comparison[0];
$ascending = Arr::get($comparison, 1, true) === true ||
Arr::get($comparison, 1, true) === 'asc';
$result = 0;
if (is_callable($prop)) {
$result = $prop($a, $b);
} else {
$values = [data_get($a, $prop), data_get($b, $prop)];
if (! $ascending) {
$values = array_reverse($values);
}
$result = $values[0] <=> $values[1];
}
if ($result === 0) {
continue;
}
return $result;
}
});
return new static($items);
}
/**
* Sort the collection in descending order using the given callback.
*
* @param callable|string $callback
* @param int $options
* @return static
*/
public function sortByDesc($callback, $options = SORT_REGULAR)
{
return $this->sortBy($callback, $options, true);
}
/**
* Sort the collection keys.
*
* @param int $options
* @param bool $descending
* @return static
*/
public function sortKeys($options = SORT_REGULAR, $descending = false)
{
$items = $this->items;
$descending ? krsort($items, $options) : ksort($items, $options);
return new static($items);
}
/**
* Sort the collection keys in descending order.
*
* @param int $options
* @return static
*/
public function sortKeysDesc($options = SORT_REGULAR)
{
return $this->sortKeys($options, true);
}
/**
* Splice a portion of the underlying collection array.
*
* @param int $offset
* @param int|null $length
* @param mixed $replacement
* @return static
*/
public function splice($offset, $length = null, $replacement = [])
{
if (func_num_args() === 1) {
return new static(array_splice($this->items, $offset));
}
return new static(array_splice($this->items, $offset, $length, $replacement));
}
/**
* Take the first or last {$limit} items.
*
* @param int $limit
* @return static
*/
public function take($limit)
{
if ($limit < 0) {
return $this->slice($limit, abs($limit));
}
return $this->slice(0, $limit);
}
/**
* Take items in the collection until the given condition is met.
*
* @param mixed $value
* @return static
*/
public function takeUntil($value)
{
return new static($this->lazy()->takeUntil($value)->all());
}
/**
* Take items in the collection while the given condition is met.
*
* @param mixed $value
* @return static
*/
public function takeWhile($value)
{
return new static($this->lazy()->takeWhile($value)->all());
}
/**
* Transform each item in the collection using a callback.
*
* @param callable $callback
* @return $this
*/
public function transform(callable $callback)
{
$this->items = $this->map($callback)->all();
return $this;
}
/**
* Reset the keys on the underlying array.
*
* @return static
*/
public function values()
{
return new static(array_values($this->items));
}
/**
* Zip the collection together with one or more arrays.
*
* e.g. new Collection([1, 2, 3])->zip([4, 5, 6]);
* => [[1, 4], [2, 5], [3, 6]]
*
* @param mixed ...$items
* @return static
*/
public function zip($items)
{
$arrayableItems = array_map(function ($items) {
return $this->getArrayableItems($items);
}, func_get_args());
$params = array_merge([function () {
return new static(func_get_args());
}, $this->items], $arrayableItems);
return new static(array_map(...$params));
}
/**
* Pad collection to the specified length with a value.
*
* @param int $size
* @param mixed $value
* @return static
*/
public function pad($size, $value)
{
return new static(array_pad($this->items, $size, $value));
}
/**
* Get an iterator for the items.
*
* @return \ArrayIterator
*/
public function getIterator()
{
return new ArrayIterator($this->items);
}
/**
* Count the number of items in the collection.
*
* @return int
*/
public function count()
{
return count($this->items);
}
/**
* Count the number of items in the collection by a field or using a callback.
*
* @param callable|string $countBy
* @return static
*/
public function countBy($countBy = null)
{
return new static($this->lazy()->countBy($countBy)->all());
}
/**
* Add an item to the collection.
*
* @param mixed $item
* @return $this
*/
public function add($item)
{
$this->items[] = $item;
return $this;
}
/**
* Get a base Support collection instance from this collection.
*
* @return \Illuminate\Support\Collection
*/
public function toBase()
{
return new self($this);
}
/**
* Determine if an item exists at an offset.
*
* @param mixed $key
* @return bool
*/
public function offsetExists($key)
{
return isset($this->items[$key]);
}
/**
* Get an item at a given offset.
*
* @param mixed $key
* @return mixed
*/
public function offsetGet($key)
{
return $this->items[$key];
}
/**
* Set the item at a given offset.
*
* @param mixed $key
* @param mixed $value
* @return void
*/
public function offsetSet($key, $value)
{
if (is_null($key)) {
$this->items[] = $value;
} else {
$this->items[$key] = $value;
}
}
/**
* Unset the item at a given offset.
*
* @param string $key
* @return void
*/
public function offsetUnset($key)
{
unset($this->items[$key]);
}
}