Array vs Stack vs Queue

    // array
    $array = (new DataTypeArray())->push('The')->push('quick')->push('brown')->push('fox');
    foreach($array as $word) print $word." "; // The quick brown fox

    print $array->pop()."\n"; // fox
    print $array->pop()."\n"; // brown
    print $array->pop()."\n"; // quick
    print $array->pop()."\n"; // The


    // stack
    $stack = (new Stack())->push('The')->push('quick')->push('brown')->push('fox');
    foreach($stack as $word) print $word." "; // fox brown quick The

    print $stack->pop()."\n"; // fox
    print $stack->pop()."\n"; // brown
    print $stack->pop()."\n"; // quick
    print $stack->pop()."\n"; // The

    // queue
    $queue = (new Queue())->push('The')->push('quick')->push('brown')->push('fox');
    foreach($queue as $word) print $word." "; // The quick brown fox
        print "\n";

    print $queue->pop()."\n"; // The
    print $queue->pop()."\n"; // quick
    print $queue->pop()."\n"; // brown
    print $queue->pop()."\n"; // fox