$result = [];
$inBlock = false;
$block = [];
foreach ($array as $current) {
    if ($inBlock) {
        $valid = false;
        foreach ($payloads as $payload) {
            if (strpos($current, $payload) === 0) {
                $valid = true;
            }
        }

        if ($valid) {
            $block[] = $current;
        } elseif ($current === $end) {
            $result = array_merge($result, $block, ['|']);
        }

        $inBlock = $valid;
    } elseif (strpos($current, $start) === 0) {
        $block = [$current];
        $inBlock = true;
    }
}