Ds\Map::hasKey

(PECL ds >= 1.0.0)

Ds\Map::hasKey — Determines 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.

范例

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
?>

以上例程的输出类似于：

bool(true)
bool(false)
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