/** @brief Calculates technical data of Ogame requirement for bat/vso/def/rech.
 *  
 *  @param[in] string $nom The name, like name in Database
 *  @return array('none','COL','GEN','EXP' : bool for class, 'CES',etc. : int for all bat/rech name in database)
 */
function ogame_elements_requirement($name = 'all');
/** @brief Calculates technical data of Ogame requirement of all building/research/fleet/defence.
 *  @return array of all building/research/fleet/defence with are array of requirement from ogame_elements_requirement
 */
function ogame_all_requirement();

//Exemples d'utilisations :
$requi_graviton = ogame_elements_requirement('Graviton');
$names = ogame_get_element_names();
foreach ($names['RECH'] as $element) {
    if ($requi_graviton[$element] !== 0) {
        echo 'Prérequis de la techno' . $element . 'au niveau minimum : ' . $requi_graviton[$element];
    }
}
$current_lab = $user_building['Lab'];
if ($current_lab < $requi_graviton['Lab']) {
    echo 'Graviton impossible car le niveau du laboratoire est insiffisant (min=' . $requi_graviton['Lab'] . ').';
}