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<?php

function _phptemplate_variables($hook, $vars = array()) {
  switch ($hook) {

    /* === NODE VARIABLES === */
    case 'node':
    { 
      // Look, only node variables enter here, can set/unset.
      $vars['a_variable_for_tpl'] = 'hello';
      break;
    }

    /* === COMMENT VARIABLES === */
    case 'comment':
    { 
      // etc..
      
      break;
    }

    /* === BLOCK VARIABLES === */
    case 'block':
    { 

      
      break;
    }

    /* === BOX VARIABLES === */
  //case 'box':
    {
      // Just a place holder.

    //break;
    }

    /* === PAGE VARIABLES === */
    case 'page':
    { 

      
      break;
    }

  } // END SWITCH CASE!!
  
  return $vars;
}