Drupal 7：全局$ user无效

Question

I am working on a Drupal module,trying to get uname and uid of the global variable $user: if $user is used within .module file it works but if not I get : Trying to get property of non-object in ... on line 377 and var_dump($user) gives null , here is my code :

MyModuleAPI.php:

function get_DB_Handler($projectname)
{  
    global $user;
    $u_name = $user->name;
    $u_id = $user->uid; //line 377
...
}

this function is called after an ajax POST query.

I will be grateful if someone clarify for me where is the difference since all files are in the same module. Any Help will be appreciated.

Answer 1

$user global variable is defined when Drupal bootstraps. You must call appropriate functions from the core to make it visible inside non-module code. Put the following to the beginning of you file:

<?php
$file_path = dirname(__FILE__);
$path = preg_replace('/sites.*/', "", $file_path);
//adjust the path to your website root directory
$path = substr_replace($path ,"",-1);

$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
$_SERVER['HTTP_HOST'] = 'site_hostname';

require_once($path . DIRECTORY_SEPARATOR . 'includes' .  DIRECTORY_SEPARATOR . 'bootstrap.inc');
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);