String.php

1. 8.x drupal/core/lib/Drupal/Component/Utility/String.php
2. 8.x drupal/core/lib/Drupal/Core/TypedData/Type/String.php
3. 8.x drupal/core/vendor/phpunit/phpunit/PHPUnit/Util/String.php
4. 8.x drupal/core/vendor/twig/twig/lib/Twig/Loader/String.php
5. 8.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/argument/String.php
6. 8.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php

<?php

/**
 * @file
 * Contains \Drupal\Core\TypedData\Type\String.
 */
namespace Drupal\Core\TypedData\Type;

use Drupal\Core\TypedData\TypedData;

/**
 * The string data type.
 *
 * The plain value of a string is a regular PHP string. For setting the value
 * any PHP variable that casts to a string may be passed.
 */
class String extends TypedData {

  /**
   * The data value.
   *
   * @var string
   */
  protected $value;

}