Ds\Map::isEmpty() function can return whether the map is empty.
public bool Ds\Map::isEmpty( void )
Ds\Map::isEmpty() function doesn't have any parameters.
Ds\Map::isEmpty() function can return true if the map is empty, or false otherwise.
<?php $map = new \Ds\Map(); var_dump($map->isEmpty()); ?>
<?php $map = new \Ds\Map(["1" => "Tutorials", "2" => "Point", "3" => "India"]); var_dump($map->isEmpty()); ?>