vendor/braintree/braintree_php/lib/Braintree/Collection.php

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<?php // phpcs:disable PEAR.Commenting.FunctionComment.MissingParamComment

namespace Braintree;

use Countable;
use IteratorAggregate;
use ArrayAccess;
use OutOfRangeException;
use ArrayIterator;

/**
 * Braintree Generic collection
 *
 * Based on Generic Collection class from:
 * {@link http://codeutopia.net/code/library/CU/Collection.php}
 */

class Collection implements Countable, IteratorAggregate, ArrayAccess
{
    protected $_collection = [];

    /**
     * Add a value into the collection
     *
     * @param string $value to be added
     *
     * @return mixed
     */
    public function add($value)
    {
        $this->_collection[] = $value;
    }

    /**
     * Set index's value
     *
     * @param integer $index thats being set
     * @param mixed   $value to set at the index
     *
     * @throws OutOfRangeException
     *
     * @return mixed
     */
    public function set($index, $value)
    {
        if ($index >= $this->count()) {
            throw new OutOfRangeException('Index out of range');
        }

        $this->_collection[$index] = $value;
    }

    /**
     * Remove a value from the collection
     *
     * @param integer $index index to remove
     *
     * @throws OutOfRangeException if index is out of range
     *
     * @return mixed