Ds\Map::hasKey

(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.

Returns true if the key could found, false otherwise.

示例 #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
?>

以上示例的输出类似于：

bool(true)
bool(false)