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

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<?php

namespace Braintree;

use JsonSerializable;

/**
 * Braintree PHP Library.
 *
 * Braintree base class and initialization
 * Provides methods to child classes. This class cannot be instantiated.
 */
abstract class Base implements JsonSerializable
{
    protected $_attributes = [];

    /**
     * don't permit an explicit call of the constructor!
     * (like $t = new Transaction())
     */
    protected function __construct()
    {
    }

    /**
     * Disable cloning of objects
     */
    protected function __clone()
    {
    }

    /**
     * Accessor for instance properties stored in the private $_attributes property
     *
     * @param string $name of the key whose value is to be returned
     *
     * @return mixed
     */
    public function __get($name)
    {
        if (isset($this->_attributes['globalId'])) {
            $this->_attributes['graphQLId'] = $this->_attributes['globalId'];
        }
        if (array_key_exists($name, $this->_attributes)) {
            return $this->_attributes[$name];
        } else {
            trigger_error('Undefined property on ' . get_class($this) . ': ' . $name, E_USER_NOTICE);
            return null;
        }
    }

    /**
     * Checks for the existence of a property stored in the private $_attributes property
     *
     * @param string $name of the key
     *
     * @return boolean
     */
    public function __isset($name)
    {