autoload - PHP spl_autoload_register not being called in certain locations Google API PHP -

i wanted integrate app google callendar.
added google php api libraries/google.

libraries/google/autoload.php is:

define ('google_lib_path', base_p . 'libraries/google/');  set_include_path(     get_include_path() . path_separator . google_lib_path ); spl_autoload_register(     function ($classname) {        $classpath = explode('_', $classname);       if ($classpath[0] != 'google') {         return;       }       // drop 'google', , maximum class file path depth in project 3.       $classpath = array_slice($classpath, 1, 2);        $filepath = google_lib_path . implode('/', $classpath) . '.php';       echo $filepath .'<br>';       if (file_exists($filepath)) {         require_once($filepath);       }     } ); 

output is:

/home/users/page/libraries/google/service/calendar.php /home/users/page/libraries/google/service.php /home/users/page/libraries/google/service/resource.php /home/users/page/libraries/google/client.php /home/users/page/libraries/google/collection.php /home/users/page/libraries/google/model.php  fatal error: class 'google_config' not found in /home/users/page/libraries/google/client.php on line 77 

after adding 1 call starts loading config, stops @ other

define ('google_lib_path', base_p . 'libraries/google/');  set_include_path(     get_include_path() . path_separator . google_lib_path ); spl_autoload_register(     function ($classname) {     // same above     } ); $x = new google_config; // added line 

output is:

/home/users/page/libraries/google/config.php /home/users/page/libraries/google/service/calendar.php /home/users/page/libraries/google/service.php /home/users/page/libraries/google/service/resource.php /home/users/page/libraries/google/client.php /home/users/page/libraries/google/collection.php /home/users/page/libraries/google/model.php  fatal error: class 'google_auth_oauth2' not found in /home/users/page/libraries/google/client.php on line 614 

autoloader seems work when wants. or there magic not know about?

php version 5.4.36-0+tld0
tried class "google_config" not found , spl_autoload_register() not working on server

edit: base_p defined as: dirname(__file__).'/' in main dir.

edit2: tried including classes manually. autoloader stops working after: libraries/google/model.php loaded. if load model.php before else (right after registering autoloader) not seem break autoloader. still stops after few autoloads.

it's old project, , found culprit:

function __autoload($class_name) {     $dir = dirname(__file__).'/';     if (file_exists($dir.'classes/'. $class_name . '.php'))         require_once $dir.'classes/'. $class_name . '.php';  } 

changing to:

spl_autoload_register(     function ($class_name) {      $dir = dirname(__file__).'/';      if (file_exists($dir.'classes/'. $class_name . '.php'))         require_once $dir.'classes/'. $class_name . '.php';  ); 

fixed other autoloader.

moral? never mix __autoload() , spl_autoload_register()
never use __autoload() deprecated , example shows, can break things.
(or stated http://php.net/manual/en/language.oop5.autoload.php)

hope someday.