HH\ImmMap::containsKey

Determines if the specified key is in the current ImmMap

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

This function is interchangeable with contains().

Guide

• Constraints

Parameters

• mixed $key

Returns

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

Examples

See Map::containsKey for usage examples.