Converts the pair to an array.
Note:
Casting to an array is not supported yet.
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An array containing all the values in the same order as the pair.
Example #1 Ds\Pair::toArray() example
<?php
$pair = new \Ds\Pair("a", 1);
var_dump($pair->toArray());
?>
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array(2) { ["key"]=> string(1) "a" ["value"]=> int(1) }