Array manager

The Magento\Framework\Stdlib\ArrayManager library provides the ability to manage deeply nested associative arrays. The library is primarily used to handle data from UI components within DataProviders and Modifiers, which are actually part of a complicated process of parsing XML files in associative arrays.

Usage

Method
Description
exists
Checks if the node exists in a given associative array
find
Finds a node in a nested array and saves its index and parent node reference
findPaths
Gets matching paths for elements with specified indexes.
get
Returns the value of the key (or node) at the end of the path. null is returned if the node could not be found.
move
Moves a value from one path to another
merge
Merges a value with a node and returns the modified data.
populate
Populates a nested array, if possible and necessary.
remove
Removes a node and returns the modified array.
replace
Updates the existing nodes and returns the modified array
set
Sets the value into a node and returns modified data.
slicePath
Retrieves a slice of the specified path.

Example 1

The following example shows how to add a custom field to the checkout billing address using the LayoutProcessor implementation.

<?php
/**
 * Process js Layout of block
 *
 * @param array $jsLayout
 *
 * @return array
 */
public function process($jsLayout)
{
    ...

    if (isset($jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']['children'])
    ) {
        $fields = $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']
        ['children']['shippingAddress']['children']['shipping-address-fieldset']['children'];

        ...
    }

    ...
}

For a cleaner implementation of the previous example, use the Magento\Framework\Stdlib\ArrayManager, library to eliminate duplicate checking and get the required array.

<?php

use Magento\Framework\Stdlib\ArrayManager;

...
    /**
     * @var ArrayManager
     */
    private $arrayManager;

    /**
     * SomeClass constructor.
     *
     * @param ArrayManager $arrayManager
     */
    public function __construct(ArrayManager $arrayManager)
    {
        $this->arrayManager = $arrayManager;
    }

    /**
     * Process js Layout of block
     *
     * @param array $jsLayout
     *
     * @return array
     */
    public function process($jsLayout): array
    {
        $path = 'components/checkout/children/steps/children/shipping-step/children/shippingAddress/children/shipping-address-fieldset/children';

        if ($fields = $this->arrayManager->get($path, $jsLayout)) {
            ...
        }

        ...
    }

...

Example 2

Suppose you have the following nested array:

$data = [
    'response' => [
        'status' => 'OK',
        'result' => [
            'items' => [
                0 => 'First item',
                1 => 'Second item',
                ...
            ],
            ...
        ]
    ]
]

You can use the Magento\Framework\Stdlib\ArrayManager library to access items in the array:

...

if ($this->arrayManager->get('response/status', $data) === 'OK') {
    $items = $this->arrayManager->get('response/result/items', $data) ?? [];

    foreach ($items as $item) {
        ...
    }
}

...

You can use the Magento\Framework\Stdlib\ArrayManager library to populate an array from the given path:

...

$this->arrayManager->populate('response/result/items', $data)

...