function hideMySQLFieldWhenNeeded(\Formal\Form $oForm, \Formal\Form\Morphology $oMorpho)
{
if ($oForm->submitted()) {
$bMySQL = intval($oForm->postValue("PROJECT_DB_MYSQL")) === 1;
} else {
$bMySQL = PROJECT_DB_MYSQL;
}
if ($bMySQL === true) {
$oMorpho->remove("PROJECT_SQLITE_FILE");
} else {
$oMorpho->remove("PROJECT_DB_MYSQL_HOST");
$oMorpho->remove("PROJECT_DB_MYSQL_DBNAME");
$oMorpho->remove("PROJECT_DB_MYSQL_USERNAME");
$oMorpho->remove("PROJECT_DB_MYSQL_PASSWORD");
}
}