Drupal playground module.

tester.php

<?php
/**
 * @file
 *
 * SANDBOX.
 */

/**
 * Implements hook_boot().
 */
function tester_boot() {

}

/**
 * Implements hook_init().
 */
function tester_init() {

}

/**
 * Implements hook_exit().
 */
function tester_exit($destination = NULL) {

}

/**
 * Implements hook_form_alter().
 */
function tester_form_alter(&$form, &$form_state, $form_id) {

}

/**
 * Page callback.
 */
function tester_page() {
  
}

/**
 * Implements hook_menu().
 */
function tester_menu() {
  return array(
    'tester' => array(
      'type' => MENU_CALLBACK,
      'page callback' => 'tester_page',
      'access callback' => TRUE,
    ),
  );
}