HH\ImmMap::contains

Determines if the specified key is in the current ImmMap

public function contains(
  mixed $key,
): bool;

This function is interchangeable with containsKey().

Guide

• Constraints

Parameters

• mixed $key

Returns

• bool - true if the specified key is present in the current ImmMap; false otherwise.

Examples

See [Map::contains](</hack/reference/class/Map/contains/#examples>) for usage examples.