PHP - Manual: Ds\Map::keys
2024-11-15
(PECL ds >= 1.0.0)
Ds\Map::keys — Returns a set of the map's keys
Returns a set containing all the keys of the map, in the same order.
此函数没有参数。
A Ds\Set containing all the keys of the map.
示例 #1 Ds\Map::keys() example
<?php
$map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);
var_dump($map->keys());
?>
以上例程的输出类似于:
object(Ds\Set)#2 (3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" }