<?php

/**
 * @file
 * Managed File (Test).
 */

/**
 * Implements hook_menu().
 */
function managed_file_test_menu() {
  $routes = [];

  $routes['managed_file_test'] = [
    'title' => 'Managed File (Test)',
    'page callback' => 'drupal_get_form',
    'page arguments' => ['managed_file_test_form'],
    'access arguments' => ['access content'],
  ];

  return $routes;
}

/**
 * Implements hook_form().
 */
function managed_file_test_form(array $form, array &$form_state) {
  $form['managed_file_test'] = [
    '#type' => 'managed_file',
    '#title' => t('Image'),
    '#styles' => TRUE,
    '#preview' => TRUE,
    '#default_value' => variable_get('managed_file_test', []),
    '#upload_validators' => [
      'file_validate_size' => [2 * 1024 * 1024],
      'file_validate_extensions' => ['png jpg jpeg gif'],
    ],
  ];

  $form['#submit'][] = __FUNCTION__ . '_submit';

  return system_settings_form($form);
}

/**
 * Implements hook_form_submit().
 */
function managed_file_test_form_submit(array $form, array &$form_state) {
  managed_file_element_submit($form['managed_file_test'], $form_state, [
    'managed_file_test', 'file', 1,
  ]);
}