Ds\Map::hasKey

(PECL ds >= 1.0.0)

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

說(shuō)明

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

Determines whether the map contains a given key.

參數(shù)

key

The key to look for.

返回值

Returns true if the key could found, false otherwise.

范例

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
?>

以上例程的輸出類(lèi)似于:

bool(true)
bool(false)