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

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<?php

namespace Braintree;

/**
 * Braintree Class Instance template
 *
 * @abstract
 */
abstract class Instance
{
    protected $_attributes = [];

    // phpcs:ignore PEAR.Commenting.FunctionComment.Missing
    public function __construct($attributes)
    {
        if (!empty($attributes)) {
            $this->_initializeFromArray($attributes);
        }
    }

    /**
     * returns private/nonexistent instance properties
     *
     * @param string $name property name
     *
     * @return mixed contents of instance properties
     */
    public function __get($name)
    {
        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;
        }
    }

    /**
     * used by isset() and empty()
     *
     * @param string $name property name
     *
     * @return boolean
     */
    public function __isset($name)
    {
        return isset($this->_attributes[$name]);
    }

    /**
     * create a printable representation of the object as:
     * ClassName[property=value, property=value]
     *
     * @return string
     */
    public function __toString()
    {
        $objOutput = Util::implodeAssociativeArray($this->_attributes);
        return get_class($this) . '[' . $objOutput . ']';