Error message

• Deprecated function: session_set_save_handler(): Providing individual callbacks instead of an object implementing SessionHandlerInterface is deprecated in drupal_session_initialize() (line 245 of C:\Apache24\htdocs\PlantZAfrica\includes\session.inc).
• Deprecated function: SearchApiServer::deleteItems(): Implicitly marking parameter $index as nullable is deprecated, the explicit nullable type must be used instead in include_once() (line 3563 of C:\Apache24\htdocs\PlantZAfrica\includes\bootstrap.inc).
• Deprecated function: SearchApiDbService::deleteItems(): Implicitly marking parameter $index as nullable is deprecated, the explicit nullable type must be used instead in include_once() (line 3563 of C:\Apache24\htdocs\PlantZAfrica\includes\bootstrap.inc).
• Deprecated function: SearchApiDbService::createFilterCondition(): Implicitly marking parameter $index as nullable is deprecated, the explicit nullable type must be used instead in include_once() (line 3563 of C:\Apache24\htdocs\PlantZAfrica\includes\bootstrap.inc).
• Deprecated function: SearchApiServiceInterface::deleteItems(): Implicitly marking parameter $index as nullable is deprecated, the explicit nullable type must be used instead in include_once() (line 3563 of C:\Apache24\htdocs\PlantZAfrica\includes\bootstrap.inc).
• Deprecated function: Using ${var} in strings is deprecated, use {$var} instead in require_once() (line 342 of C:\Apache24\htdocs\PlantZAfrica\includes\module.inc).