dbernar1/index.php

## index.php
<?php
/*
 * This code implements a simple higher/lower guessing game.
 *
 * The computer picks a random number and the user guesses by way of an HTML form.
 *
 * The user is given hints if they guess incorrectly with the ability to try again.
 *
 * Upon winning the game the user can add their name to a session-based leaderboard.
 */

require 'details.php';

when_the( 'user_submits_a_guess', 'let_them_know_whether_they_guessed_correctly' );

when_the( 'user_submits_their_name_for_leaderboard', 'add_their_name_to_leaderboard_and_restart_game' );

when_the( 'user_requests_a_reset', 'refresh_to_start_a_new_game' );

otherwise( 'start_a_new_game' );

## session_game_functions.php
<?php
/* Constants to specify the numeric bounds for the guessing name. */

define('SECRET_NUMBER_MINIMUM_VALUE', 1);
define('SECRET_NUMBER_MAXIMUM_VALUE', 10);

session_start();

function let_them_know_whether_they_guessed_correctly() {
	increment_the_number_of_guess_attempts();
	if ( the_guess_is_correct() ) {
		tell_the_user(
			'You got it in ' . number_of_guess_attempts() .  ' guesses!',
			$and_display = 'leaderboard-highscore-form'
		);
	} elseif ( the_guess_is_too_low() ) {
		tell_the_user(
			'Incorrect Guess! Try a larger number.',
			$and_display = 'guess-form'
		);
	} else /* the guess is too high */ {
		tell_the_user(
			'Incorrect Guess! Try a smaller number.',
			$and_display = 'guess-form'
		);
	}
}

function add_their_name_to_leaderboard_and_restart_game() {
	add_user_name_to_leaderboard();
	refresh_to_start_a_new_game();
}

function refresh_to_start_a_new_game() {
	header( 'HTTP/1.0 302 Found' );
	header( 'Location: ' . $_SERVER[ 'PHP_SELF' ] );
}

function start_a_new_game() {
	reset_guess_attempt_count();
	create_new_secret_number();
	tell_the_user(
		"I've picked a random number between " . SECRET_NUMBER_MINIMUM_VALUE . " and " . SECRET_NUMBER_MAXIMUM_VALUE . ". Can you guess it?",
		$and_display = 'guess-form'
	);
}

function reset_guess_attempt_count() {
	$_SESSION['guess_count'] = 0;
}

function create_new_secret_number() {
	$_SESSION['secret_number'] = create_random_number_between( SECRET_NUMBER_MINIMUM_VALUE, SECRET_NUMBER_MAXIMUM_VALUE );
}

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

function tell_the_user( $message, $form_to_display = 'guess-form' ) {
?>
<!DOCTYPE html>
<html>
	<head>
		<title>Guessing Game</title>
	</head>
	<body>
		<h1>Guessing Game</h1>
		<p><?php echo $message ?></p>

		<?php if ( 'guess-form' === $form_to_display ): ?>
		<form method="post">
			<label for="user_guess">Your Guess</label>
			<input id="user_guess" name="user_guess">
			<input type="submit" value="Guess" name="button">
			<input type="submit" value="Reset" name="button">
		</form>
		<?php elseif ( 'leaderboard-highscore-form' === $form_to_display ): ?>
		<form method="post">
			<label for="user_name">Your Name For The Highscore Leaderboard:</label>
			<input id="user_name" name="user_name">
			<input type="submit" value="Submit Name" name="button">
		</form>
		<?php endif ?>

		<h2>Leader Board</h2>
		<?php
		if ( any_highscores_have_been_recorded() ) {
			display_leaderboard();
		} else {
			display_notice_about_no_highscores();
		}
		?>
	</body>
</html>
<?php
}

function display_notice_about_no_highscores() {
?>
<p>No highscores yet!</p>
<?php
}

function display_leaderboard() {
?>
<ul>
	<?php foreach ( $_SESSION['leaderboard'] as $highscore ): ?>
	<li>
		<?= $highscore['guess_count'] ?> - <?= $highscore['user_name'] ?>
	</li>
	<?php endforeach ?>
</ul>
<?php
}

/* Functions for dealing with user POSTed forms. */

function user_submits_a_guess() {
	return user_presses_button_labeled( 'Guess' );
}

function user_requests_a_reset() {
	return user_presses_button_labeled( 'Reset' );
}

function user_submits_their_name_for_leaderboard() {
	return user_presses_button_labeled( 'Submit Name' );
}

function user_presses_button_labeled( $label ) {
	return isset($_POST['button']) && $_POST['button'] === $label;
}

/* These functions deal with the state of our game. */

function any_highscores_have_been_recorded() {
	return $the_leaderboard_is_not_empty = ! empty( $_SESSION['leaderboard'] );
}

/* These functions deal with a user's guess. */

function the_guess_is_correct() {
	return
		$user_has_submitted_a_guess =
			isset($_POST['user_guess'])
	   && $submitted_guess_matches_secret_number =
			(int) $_POST['user_guess'] === $_SESSION['secret_number']
	;
}

function the_guess_is_too_high() {
	return $submitted_guess_is_greater_than_secret_number =
		$_POST['user_guess'] > $_SESSION['secret_number']
	;
}

function the_guess_is_too_low() {
	return $submitted_guess_is_less_than_secret_number =
		$_POST['user_guess'] < $_SESSION['secret_number']
	;
}

function number_of_guess_attempts() {
	return $_SESSION['guess_count'];
}

function increment_the_number_of_guess_attempts() {
	$_SESSION['guess_count']++;
}

function add_user_name_to_leaderboard() {
	initialize_the_leaderboard_if_needed();
	add_submitted_user_name_to_leaderboard();
	sort_the_leaderboard();
}

function initialize_the_leaderboard_if_needed() {
	if ( the_leaderboard_has_not_been_initialized() ) {
		initialize_the_leaderboard();
	}
}

function the_leaderboard_has_not_been_initialized() {
	return ! isset( $_SESSION['leaderboard'] );
}

function initialize_the_leaderboard() {
	$_SESSION['leaderboard'] = array();
}

function add_submitted_user_name_to_leaderboard() {
	$_SESSION['leaderboard'][] = array(
		'user_name' => $_POST['user_name'],
		'guess_count' => $_SESSION['guess_count']
	);
}

function sort_the_leaderboard() {
	usort( $_SESSION['leaderboard'], compare_by( 'guess_count' ) );
}

/* This function is used by the previous one as a custom comparator for usort. */

function compare_by( $column_name ) {
	return function( $a, $b ) use ( $column_name ){
		if ( $a[ $column_name ] == $b[ $column_name ] ) {
			return 0;
		}
		return ( $a[ $column_name ] < $b[ $column_name ] ) ? -1 : 1;
	};
}

/* Vocabulary helpers */

function when_the( $user_performs_an_action, $respond_by_doing ) {
	if ( $user_performs_an_action() ) {
		$respond_by_doing();
		exit;
	}
}

function otherwise( $do_this ) {
	$do_this();
}
	<?php
	/*
	* This code implements a simple higher/lower guessing game.
	*
	* The computer picks a random number and the user guesses by way of an HTML form.
	*
	* The user is given hints if they guess incorrectly with the ability to try again.
	*
	* Upon winning the game the user can add their name to a session-based leaderboard.
	*/

	require 'details.php';

	when_the( 'user_submits_a_guess', 'let_them_know_whether_they_guessed_correctly' );

	when_the( 'user_submits_their_name_for_leaderboard', 'add_their_name_to_leaderboard_and_restart_game' );

	when_the( 'user_requests_a_reset', 'refresh_to_start_a_new_game' );

	otherwise( 'start_a_new_game' );
	<?php
	/* Constants to specify the numeric bounds for the guessing name. */

	define('SECRET_NUMBER_MINIMUM_VALUE', 1);
	define('SECRET_NUMBER_MAXIMUM_VALUE', 10);

	session_start();

	function let_them_know_whether_they_guessed_correctly() {
	increment_the_number_of_guess_attempts();
	if ( the_guess_is_correct() ) {
	tell_the_user(
	'You got it in ' . number_of_guess_attempts() . ' guesses!',
	$and_display = 'leaderboard-highscore-form'
	);
	} elseif ( the_guess_is_too_low() ) {
	tell_the_user(
	'Incorrect Guess! Try a larger number.',
	$and_display = 'guess-form'
	);
	} else /* the guess is too high */ {
	tell_the_user(
	'Incorrect Guess! Try a smaller number.',
	$and_display = 'guess-form'
	);
	}
	}

	function add_their_name_to_leaderboard_and_restart_game() {
	add_user_name_to_leaderboard();
	refresh_to_start_a_new_game();
	}

	function refresh_to_start_a_new_game() {
	header( 'HTTP/1.0 302 Found' );
	header( 'Location: ' . $_SERVER[ 'PHP_SELF' ] );
	}

	function start_a_new_game() {
	reset_guess_attempt_count();
	create_new_secret_number();
	tell_the_user(
	"I've picked a random number between " . SECRET_NUMBER_MINIMUM_VALUE . " and " . SECRET_NUMBER_MAXIMUM_VALUE . ". Can you guess it?",
	$and_display = 'guess-form'
	);
	}

	function reset_guess_attempt_count() {
	$_SESSION['guess_count'] = 0;
	}

	function create_new_secret_number() {
	$_SESSION['secret_number'] = create_random_number_between( SECRET_NUMBER_MINIMUM_VALUE, SECRET_NUMBER_MAXIMUM_VALUE );
	}

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

	function tell_the_user( $message, $form_to_display = 'guess-form' ) {
	?>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Guessing Game</title>
	</head>
	<body>
	<h1>Guessing Game</h1>
	<p><?php echo $message ?></p>

	<?php if ( 'guess-form' === $form_to_display ): ?>
	<form method="post">
	<label for="user_guess">Your Guess</label>
	<input id="user_guess" name="user_guess">
	<input type="submit" value="Guess" name="button">
	<input type="submit" value="Reset" name="button">
	</form>
	<?php elseif ( 'leaderboard-highscore-form' === $form_to_display ): ?>
	<form method="post">
	<label for="user_name">Your Name For The Highscore Leaderboard:</label>
	<input id="user_name" name="user_name">
	<input type="submit" value="Submit Name" name="button">
	</form>
	<?php endif ?>

	<h2>Leader Board</h2>
	<?php
	if ( any_highscores_have_been_recorded() ) {
	display_leaderboard();
	} else {
	display_notice_about_no_highscores();
	}
	?>
	</body>
	</html>
	<?php
	}

	function display_notice_about_no_highscores() {
	?>
	<p>No highscores yet!</p>
	<?php
	}

	function display_leaderboard() {
	?>
	<ul>
	<?php foreach ( $_SESSION['leaderboard'] as $highscore ): ?>
	<li>
	<?= $highscore['guess_count'] ?> - <?= $highscore['user_name'] ?>
	</li>
	<?php endforeach ?>
	</ul>
	<?php
	}

	/* Functions for dealing with user POSTed forms. */

	function user_submits_a_guess() {
	return user_presses_button_labeled( 'Guess' );
	}

	function user_requests_a_reset() {
	return user_presses_button_labeled( 'Reset' );
	}

	function user_submits_their_name_for_leaderboard() {
	return user_presses_button_labeled( 'Submit Name' );
	}

	function user_presses_button_labeled( $label ) {
	return isset($_POST['button']) && $_POST['button'] === $label;
	}

	/* These functions deal with the state of our game. */

	function any_highscores_have_been_recorded() {
	return $the_leaderboard_is_not_empty = ! empty( $_SESSION['leaderboard'] );
	}

	/* These functions deal with a user's guess. */

	function the_guess_is_correct() {
	return
	$user_has_submitted_a_guess =
	isset($_POST['user_guess'])
	&& $submitted_guess_matches_secret_number =
	(int) $_POST['user_guess'] === $_SESSION['secret_number']
	;
	}

	function the_guess_is_too_high() {
	return $submitted_guess_is_greater_than_secret_number =
	$_POST['user_guess'] > $_SESSION['secret_number']
	;
	}

	function the_guess_is_too_low() {
	return $submitted_guess_is_less_than_secret_number =
	$_POST['user_guess'] < $_SESSION['secret_number']
	;
	}

	function number_of_guess_attempts() {
	return $_SESSION['guess_count'];
	}

	function increment_the_number_of_guess_attempts() {
	$_SESSION['guess_count']++;
	}

	function add_user_name_to_leaderboard() {
	initialize_the_leaderboard_if_needed();
	add_submitted_user_name_to_leaderboard();
	sort_the_leaderboard();
	}

	function initialize_the_leaderboard_if_needed() {
	if ( the_leaderboard_has_not_been_initialized() ) {
	initialize_the_leaderboard();
	}
	}

	function the_leaderboard_has_not_been_initialized() {
	return ! isset( $_SESSION['leaderboard'] );
	}

	function initialize_the_leaderboard() {
	$_SESSION['leaderboard'] = array();
	}

	function add_submitted_user_name_to_leaderboard() {
	$_SESSION['leaderboard'][] = array(
	'user_name' => $_POST['user_name'],
	'guess_count' => $_SESSION['guess_count']
	);
	}

	function sort_the_leaderboard() {
	usort( $_SESSION['leaderboard'], compare_by( 'guess_count' ) );
	}

	/* This function is used by the previous one as a custom comparator for usort. */

	function compare_by( $column_name ) {
	return function( $a, $b ) use ( $column_name ){
	if ( $a[ $column_name ] == $b[ $column_name ] ) {
	return 0;
	}
	return ( $a[ $column_name ] < $b[ $column_name ] ) ? -1 : 1;
	};
	}

	/* Vocabulary helpers */

	function when_the( $user_performs_an_action, $respond_by_doing ) {
	if ( $user_performs_an_action() ) {
	$respond_by_doing();
	exit;
	}
	}

	function otherwise( $do_this ) {
	$do_this();
	}