PHP code example of mleczek / collections

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

mleczek / collections example snippets

$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"

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

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

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

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

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

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

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

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

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

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

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

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

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

$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' => [...]]

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

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

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

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

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

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

$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 => [...]]

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

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

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

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

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

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

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

$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]

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

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

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

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

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

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

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

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

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

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

$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]

$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]

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

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

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

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

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

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

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

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

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