(PECL ds >= 1.0.0)
Ds\Map::hasKey — Determines whether the map contains a given key
public Ds\Map::hasKey ( mixed $key ) : bool
Determines whether the map contains a given key.
key
The key to look for.
Returns true
if the key could found, false
otherwise.
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/ds-map.haskey.php