Description
   The class must be either in memory (PEAR_Validate or
   PEAR_Validate_PECL) or be available for include_once()
   via a simple formula:  Transform the underscores (_) into
   directory separators (/), append .php and
   include.
  
   A validation class named Foo_Bar_Baz should be available for
   inclusion via this code:
  
   
| <?php
include_once 'Foo/Bar/Baz.php';
?> | 
  
   In addition, the validation package must be available for installation from the channel
   with the version number to install specified by the $version parameter.