FlipFlop example with array_reduce

flipFlopReduce.php

<?php

$a = range(1, 4);
$example = [1,2,3,4,5,6,3,7];
$a = $example;

print_r(array_reduce(
    $a,
    // (..) ==1, ==1
    function ($carry, $item) {
        if ($item == 1) {
            $carry[] = $item;
        }
        return $carry;
    }
));

print_r(array_reduce(
    $a,
    // (..) ==1, ==3
    function ($carry, $item) {
        static $switch = false;

        if ($item == 1 || $switch === true) {
            $switch = true;
        }

        if ($switch) {
            $carry[] = $item;
        }

        if ($item == 3) {
            $switch = false;
        }

        return $carry;
    }
));


print_r(array_reduce(
    $a,
    // (...) ==1, ==1
    function ($carry, $item) {
        static $switch = false;

        if ($item == 1 || $switch === true) {
            $switch = true;
            $carry[] = $item;
            return $carry;
        }

        // condition2
        elseif ($item == 1 && $switch === true) {
            $switch = false;
        }
        return $carry;
    }
));