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Ds\Map::hasKey

(PECL ds >= 1.0.0)

Ds\Map::hasKeyDetermines whether the map contains a given key

说明

public Ds\Map::hasKey(mixed $key): bool

Determines whether the map contains a given key.

参数

key

The key to look for.

返回值

Returns true if the key could found, false otherwise.

示例

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)
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