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count

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.

Provides the number of elements in the current Set

public function count(): int;

Returns​

  • int - The number of elements in the current Set.

Examples​

$s = Set {};
\var_dump($s->count());

$s = Set {'red', 'green', 'blue', 'yellow'};
\var_dump($s->count());