(PECL ds >= 1.0.0)
Ds\Set::sum — Returns the sum of all values in the set
Returns the sum of all values in the set.
Note:
Arrays and objects are considered equal to zero when calculating the sum.
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The sum of all the values in the set as either a float or int depending on the values in the set.
Example #1 Ds\Set::sum() integer example
<?php
$set = new \Ds\Set([1, 2, 3]);
var_dump($set->sum());
?>
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int(6)
Example #2 Ds\Set::sum() float example
<?php
$set = new \Ds\Set([1, 2.5, 3]);
var_dump($set->sum());
?>
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float(6.5)