SMARTY_CORE_DIR
     This should be the full system path to the location of the Smarty core
     files. If not defined, Smarty will default this constant to the
     internals/
     sub-directory below
     SMARTY_DIR.
     If defined, the path must end with a slash.
     Use this constant when manually including any of the core.* files.
    
Example 11-2. SMARTY_CORE_DIR 
<?php
  // load core.get_microtime.php require_once(SMARTY_CORE_DIR . 'core.get_microtime.php');
  ?>
 |  
  | 
    See also
    $smarty.const