How can the code structure be optimized to avoid the need for multiple PHP files and improve the overall efficiency of the number guessing game implementation?

The code structure can be optimized by consolidating all the necessary functions and logic into a single PHP file. This can be achieved by using functions to modularize the code and make it more organized. By doing so, the code will be easier to maintain and understand, leading to improved efficiency in the number guessing game implementation.

<?php

function generateRandomNumber($min, $max) {
    return rand($min, $max);
}

function checkGuess($number, $guess) {
    if ($guess == $number) {
        return "Congratulations! You guessed the correct number.";
    } elseif ($guess < $number) {
        return "Try a higher number.";
    } else {
        return "Try a lower number.";
    }
}

$min = 1;
$max = 100;
$randomNumber = generateRandomNumber($min, $max);

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $guess = $_POST["guess"];
    $result = checkGuess($randomNumber, $guess);
} else {
    $result = "";
}

?>

<!DOCTYPE html>
<html>
<head>
    <title>Number Guessing Game</title>
</head>
<body>
    <h1>Number Guessing Game</h1>
    <p><?php echo $result; ?></p>
    <form method="post">
        <label for="guess">Enter your guess (between <?php echo $min; ?> and <?php echo $max; ?>):</label>
        <input type="number" name="guess" id="guess" required>
        <button type="submit">Submit</button>
    </form>
</body>
</html>