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Ds\Map::sum — Returns the sum of all values in the map
Returns the sum of all values in the map.
Note:
Arrays and objects are considered equal to zero when calculating the sum.
此函数没有参数。
The sum of all the values in the map as either a float or int depending on the values in the map.
Example #1 Ds\Map::sum() integer example
<?php
$map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);
var_dump($map->sum());
?>
以上例程的输出类似于：
int(6)
Example #2 Ds\Map::sum() float example
<?php
$map = new \Ds\Map(["a" => 1, "b" => 2.5, "c" => 3]);
var_dump($map->sum());
?>
以上例程的输出类似于：
float(6.5)