PHP Collections

This package was created to provide simple way to manipulate arrays in PHP. The package was inspired by the Laravel Collections.

Installation

composer require mleczek/collections

Getting started

Convert any array to collection:

$collection = new \Mleczek\Collections\Collection([
    ['id' => 3, 'firstName' => 'Debra', 'lastName' => 'Barnett'],
    ['id' => 8, 'firstName' => 'Ronnie', 'lastName' => 'Coleman'],
    ['id' => 2, 'firstName' => 'Gabriel', 'lastName' => 'Adams'],
]);

// ...and perform some operations:
$names = $collection
    ->whereIn(fn($x) => $x['id'], [3, 2])
    ->map(fn($x) => $x['firstName'] .' '. $x['lastName'])
    ->join(', ');

// $names is equal "Debra Barnett, Gabriel Adams"

You can also do this using collection helper method:

$sum = collection([1, 2, 5])
    ->map(fn($x) => $x * 2)
    ->sum();

// $sum is equal 16 (2+4+10)

Available operations

• addFirst
• addLast
• avg
• chunk
• count
• each
• firstKey
• first
• flatten
• groupBy
• has
• isAssociative
• isEmpty
• isIndexed
• isNotEmpty
• join
• keyBy
• keys
• lastKey
• last
• map
• max
• merge
• min
• randomKey
• random
• reduce
• removeFirst
• removeLast
• reverse
• skip
• sortDesc
• sort
• sum
• take
• toArray
• unique
• values
• whereIn
• where

addFirst

Add item at the beginning of the collection.

$collection = collection([2, 3])->addFirst(1); // [1, 2, 3]

addLast

Add item at the end of the collection.

$collection = collection([2, 3])->addLast(4); // [2, 3, 4]

avg

Calculate average value from items. Zero if there're no items in collection.

$avg = collection([1, 2, 6])->avg(); // 3

$items = [
    ['value' => 3],
    ['value' => 7],
];

$avg = collection($items)
    ->avg(fn($item, $key) => $item['value']); // 5

Throws when trying to calculate avg from non-number value.

chunk

Breaks into multiple, smaller collections of a given size.

E.g. for chunk size 2 the output array for [1, 2, 3] will be [[1, 2], [3]].

$collection = collection([1, 2, 3])->chunk(2); // [[1, 2], [3]]

count

The total number of items in the collection.

$count = collection([1, 2])->count(); // 2

each

Iterate over each item.

collection(['a' => 1, 'b' => 2])
    ->each(fn($item, $key) => printf("$key:$item"));

firstKey

Get first item key.

$key = collection(['a' => 1, 'b' => 2])->firstKey(); // 'a'

first

Get first item value.

$item = collection(['a' => 1, 'b' => 2])->first(); // 1

flatten

Convert array of arrays to array (remove one dimension).

$collection = collection([[1, 2], [3]])->flatten(); // [1, 2, 3]

groupBy

Groups the collection's items by a given key.

$items = [
    ['brand' => 'Jeep', 'model' => 'Cherokee Latitude'],
    ['brand' => 'Nissan', 'model' => 'Sentra SV'],
    ['brand' => 'Nissan', 'model' => 'Murano Platinum'],
];

$collection = collection($items)
    ->groupBy(fn($item, $key) => $item['brand']); // ['Jeep' => [...], 'Nissan' => [...]]

has

Check whether collection has items which match given closure.

$test = collection([2, 7, 3])
    ->has(fn($item, $key) => $item === 7); // true

isAssociative

Check whether collection is an associative array.

$test = collection([1, 4])->isAssociative(); // false
$test = collection(['a' => 1, 4])->isAssociative(); // true

See also isIndexed method.

isEmpty

Check whether collection has zero items.

$test = collection([])->isEmpty(); // true

isIndexed

Check whether collection is an indexed array.

$test = collection([1, 4])->isIndexed(); // true
$test = collection(['a' => 1, 4])->isIndexed(); // false

See also isAssociative method.

isNotEmpty

Check whether collection has any item.

$test = collection([8, 2])->isNotEmpty(); // true

join

Join all items with given glue.

$string = collection(['Nissan', 'Jeep', 'Ford'])->join(', '); // 'Nissan, Jeep, Ford'

keyBy

Change collection's items keys.

$items = [
    ['id' => 5, 'username' => 'lorraine'],
    ['id' => 1, 'username' => 'gabriel.hill'],
    ['id' => 4, 'username' => 'steward'],
];

$collection = collection($items)
    ->keyBy(fn($item, $key) => $item['id']); // [5 => [...], 1 => [...], 4 => [...]]

If multiple items have the same key, the exception will be thrown.

keys

Returns all of the collection's keys.

$array = collection(['a' => 1, 'b' => 3])->keys(); // ['a', 'b']

lastKey

Get last item key.

$key = collection(['a' => 1, 'b' => 2])->lastKey(); // 'b'

last

Get last item value.

$item = collection(['a' => 1, 'b' => 2])->last(); // 2

map

Iterates through the collection and modify each item.

$collection = collection([1, 4])
    ->map(fn($item, $key) => $item * 2); // [2, 8]

Array keys are preserved.

max

Get maximum value from items.

The ">" operator is used to find maximum value.

$max = collection([1, 4, 7])->max(); // 7

$items = [
    ['value' => 3],
    ['value' => 8],
];

$avg = collection($items)
    ->max(fn($item, $key) => $item['value']); // 8

merge

Merge collection/array to current array.

In associative arrays values for existing keys will be overwrite. In indexed arrays new values are always appended at the end of collection.

$collection = collection([1, 2])->merge([3, 4]); // [1, 2, 3, 4]

$first = collection([1, 2]);
$second = collection(['a' => 1, 'b' => 2]);

$collection = $first->merge($second);// [1, 2, 'a' => 1, 'b' => 2]

min

Get minimum value from items.

The "<" operator is used to find minimum value.

$max = collection([1, 4, 7])->min(); // 1

$items = [
    ['value' => 3],
    ['value' => 8],
];

$avg = collection($items)
    ->min(fn($item, $key) => $item['value']); // 3

randomKey

Get random key from collection.

Returns null if collection is empty.

$item = collection(['a' => 1, 'b' => 2])->randomKey();

random

Get random item value.

Returns null if collection is empty.

$item = collection([1, 8, 4])->random();

reduce

Reduces the collection to a single value, passing the result of each iteration into the subsequent iteration.

$initialState = 2;
$result = collection([1, 8, 4])
    ->reduce(fn($item, $state) => $state + $item, $initialState); // 15

removeFirst

Remove first N items from collection.

$collection = collection([1, 8, 4])->removeFirst(); // [8, 4]
$collection = collection([1, 8, 4])->removeFirst(2); // [4]

removeLast

Remove last N items from collection.

$collection = collection([1, 8, 4])->removeLast(); // [1, 8]
$collection = collection([1, 8, 4])->removeLast(2); // [1]

reverse

Reverse items order.

$collection = collection([1, 8, 4])->reverse(); // [4, 8, 1]

skip

Skip N first items.

$collection = collection([1, 8, 4])->skip(); // [8, 4]
$collection = collection([1, 8, 4])->skip(2); // [4]

sortDesc

Sort items descending.

Strings are sorted in case insensitive manner.

$collection = collection([1, 8, 4])->sortDesc(); // [8, 4, 1]

$items = [
    ['value' => 3],
    ['value' => 7],
];

$collection = collection($items)
    ->sortDesc(fn($item) => $item['value']); // ['value' => 7, 'value' => 3]

See also sort method.

sort

Sort items ascending.

Strings are sorted in case insensitive manner.

$collection = collection([1, 8, 4])->sort(); // [1, 4, 8]

$items = [
    ['value' => 3],
    ['value' => 7],
];

$collection = collection($items)
    ->sort(fn($item) => $item['value']); // ['value' => 3, 'value' => 7]

See also sortDesc method.

sum

Returns the sum of all items in the collection.

$sum = collection([1, 2, 6])->sum(); // 9

$items = [
    ['value' => 3],
    ['value' => 7],
];

$sum = collection($items)
    ->sum(fn($item, $key) => $item['value']); // 10

Throws when trying to calculate sum from non-number value.

take

Take N first items.

$collection = collection([1, 8, 4])->take(); // [1]
$collection = collection([1, 8, 4])->take(2); // [1, 8]

toArray

Returns collection's items.

$array = collection([6, 3, 1])->toArray(); // [6, 3, 1]

unique

Left only items with unique value.

$collection = collection([6, 1, 3, 1])->unique(); // [6, 1, 3]

First occurrence is taken if multiple same values are encountered.

$items = [
    ['brand' => 'Jeep', 'model' => 'Cherokee Latitude'],
    ['brand' => 'Nissan', 'model' => 'Sentra SV'],
    ['brand' => 'Nissan', 'model' => 'Murano Platinum'],
];

$collection = collection([$items])
    ->unique(fn($item, $key) => $item['brand']);

values

Returns all of the collection's values (as indexed array).

$values = collection(['a' => 1, 'b' => 2])->values(); // [1, 2]

whereIn

Return collection with items that needle is in haystack of accepted values.

$collection = collection([8, 4, 2])
    ->whereIn(fn($item, $key) => $item, [4, 7, 2]); // [4, 2]

where

Return collection with items which match given criteria.

$collection = collection([8, 4, 2])
    ->where(fn($item, $key) => $item > 3); // [8, 4]