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get

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.

Returns the value at the specified key in the current Map

public function get(
  Tk $key,
): ?Tv;

If the key is not present, null is returned. If you would rather have an exception thrown when a key is not present, then use at().

Parameters​

  • Tk $key

Returns​

  • ?Tv - The value at the specified key; or null if the key does not exist.

Examples​

This example shows how get can be used to access the value at a key that may not exist:

$m = Map {
  'red' => '#ff0000',
  'green' => '#00ff00',
  'blue' => '#0000ff',
  'yellow' => '#ffff00',
};

// Prints the value at key 'red'
\var_dump($m->get('red'));

// Prints NULL since key 'blurple' doesn't exist
\var_dump($m->get('blurple'));