$plugins_dir
       This is the directory (or directories) where Smarty will look for the
       plugins that it needs. Default is
       "plugins" under the
       SMARTY_DIR. If you
       supply a relative path, Smarty will first look under the
       SMARTY_DIR, then
       relative to the cwd (current working directory), then relative to the PHP
       include_path. If $plugins_dir is an array of directories, Smarty will
       search for your plugin in each plugin directory in the order they are
       given.
      
Technical Note: 
          For best performance, do not setup your $plugins_dir to have to use
          the PHP include path. Use an absolute pathname, or a path relative
          to SMARTY_DIR or the cwd.
          
| Example 12-1. Appending a local plugin dir | 
<?php
 $smarty->plugins_dir[] = 'includes/my_smarty_plugins';
 
 ?>
 | 
 | 
| Example 12-2. multiple $plugins_dir | 
<?php
 $smarty->plugins_dir = array(
 'plugins', // the default under SMARTY_DIR
 '/path/to/shared/plugins',
 '../../includes/my/plugins'
 );
 
 ?>
 | 
 |