Ds\Map::first
(PECL ds >= 1.0.0)
Ds\Map::first — Returns the first pair in the map
参数
此函数没有参数。
返回值
The first pair in the map.
错误／异常
UnderflowException if empty.
范例
示例 #1 Ds\Map::first() example
<?php
$map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);
var_dump($map->first());
?>
以上例程的输出类似于：
object(Ds\Pair)#2 (2) {
["key"]=>
string(1) "a"
["value"]=>
int(1)
}
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