Flip Flop example

flipFlopExample.php

<?php

function flipFlop2(): \Generator
{
    $switch = false;

    while (true) {
        $value = yield;

        // condition1
        if ($value == 1) {
            $switch = true;
        }

        yield $switch;

        // condition2
        if ($value == 1) {
            $switch = false;
        }
    }
}

function flipFlop3(): \Generator
{
    $switch = false;

    while (true) {
        $value = yield;

        // condition1
        if ($value == 1) {
            $switch = true;
            yield $switch;

        // condition2
        } elseif ($value == 1) {
            $result = $switch;
            $switch = false;
            yield $result;
        // none of the two match
        } else {
            yield $switch;
        }
    }
}

$a = range(1, 4);
$example = [1,2,3,4,5,6,3,7];
$a = $example;
$flipFlop2 = flipFlop2();
$flipFlop3 = flipFlop3();

$result = [];
foreach ($a as $i) {
    if ($return = $flipFlop3->send($i)) {
        $result[] = $i;
    }
    echo "$i => " . ($return ? 'true' : 'false') . "\n";

    $flipFlop3->next();
}

print_r($result);