(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.
Example #1 Ds\Map::hasKey() example
<?php $map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]); var_dump($map->hasKey("a")); // true var_dump($map->hasKey("e")); // false ?>
The above example will output something similar to:
bool(true) bool(false)
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https://www.php.net/manual/en/ds-map.haskey.php