Functions for working with Pairs.
<?php
use function Php\Pairs\Pairs\cons;
use function Php\Pairs\Pairs\car;
use function Php\Pairs\Pairs\cdr;
use function Php\Pairs\Pairs\toString;
$pair = cons(1, 2);
$one = car($pair); // $one = 1;
$two = cdr($pair); // $two = 2;
$str = toString($pair); // '(1, 2)'
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