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isEmpty

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

Checks if the current Map is empty

public function isEmpty(): bool;

Returns​

  • bool - true if the current Map is empty; false otherwise.

Examples​

$m = Map {};
\var_dump($m->isEmpty());

$m = Map {
  'red' => '#ff0000',
  'green' => '#00ff00',
  'blue' => '#0000ff',
  'yellow' => '#ffff00',
  'purple' => '#663399',
};
\var_dump($m->isEmpty());