(PECL ds >= 1.0.0)
Ds\Map::merge — Returns the result of adding all given associations
public Ds\Map::merge ( mixed $values ) : Ds\Map
Returns the result of associating all keys of a given traversable object or array with their corresponding values, combined with the current instance.
Note:
Values of the current instance will be overwritten by those provided where keys are equal.
values
A traversable object or an array.
The result of associating all keys of a given traversable object or array with their corresponding values, combined with the current instance.
Note:
The current instance won't be affected.
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https://www.php.net/manual/en/ds-map.merge.php