dwaard/rps.php

## rps.php
<?php
	//Now, let's play
	$returnText = 'You have not played yet. Select your weapon and hit the Play button';
	if (userHasValidSelection()) {
		$userChoice = $_GET['userSelect'];
		//Let the computer make a choice
		$computerChoice = letComputerChoose();
		//Now, let's play, and return the result  text!
		$returnText = "The server chose $computerChoice. ";
		$result = compare($userChoice, $computerChoice);
		if($result == 0) {
			$returnText .= 'The result is a Tie!';
		} else if($result == 1) {
			$returnText .= 'You won!';
		} else {
			$returnText .= 'The server won!';
		}
	}

?>

<!DOCTYPE html>
<html>
	<head><title>Experiment</title></head>
	<body>
		<h1>Rock, Paper, Scissors in PHP</h1>
		<form method="GET">
			<select name="userSelect">
				<option value="rock" <?php echo isSelected('rock'); ?> >Rock</option>
				<option value="paper" <?php echo isSelected('paper'); ?> >Paper</option>
				<option value="scissors" <?php echo isSelected('scissors'); ?> >Scissors</option>
			</select>
			<input type="submit" value="Play"></input>
		</form>
		<p><?php echo $returnText; ?></p>
	</body>
</html>

<?php
/**
 * Returns TRUE when the user has sent a valid selection
 */
function userHasValidSelection() {
    return isset($_GET['userSelect']) && in_array($_GET['userSelect'], ["rock", "paper", "scissors"]);
}

/**
 * returns the text selected if the user has sent a query var and $choice equals the value of the queryvar
 */
function isSelected($choice) {
	if (isset($_GET['userSelect']) && $_GET['userSelect'] === $choice) {
		return 'selected';
	}
}

/**
 * Let the computer make a choice
 * Returns at random: "rock", "paper" or "scissors"
 */
function letComputerChoose() {
    $numberChoice = rand(0, 2);
    if ($numberChoice == 0) {
        return "rock";
    }
    if ($numberChoice == 1) {
        return "paper";
    }
    return "scissors";

}

/**
 * Compares two choices and returns a number representing the result:
 * 0 = the result is a Tie
 * 1 = $choice1 wins
 * 2 = $choice2 wins
 */
function compare($choice1, $choice2) {
	if ($choice1 === $choice2) {
		return 0;
	}
	if ($choice1 === 'rock') {
		if ($choice2 === 'scissors') {
			return 1;
		} else {
			return 2;
		}
	}
	if ($choice1 === 'paper') {
		if ($choice2 === 'rock') {
			return 1;
		} else {
			return 2;
		}
	}
	if ($choice1 === 'scissors') {
		if ($choice2 === 'paper') {
			return 1;
		} else {
			return 2;
		}
	}
}
?>
	<?php
	//Now, let's play
	$returnText = 'You have not played yet. Select your weapon and hit the Play button';
	if (userHasValidSelection()) {
	$userChoice = $_GET['userSelect'];
	//Let the computer make a choice
	$computerChoice = letComputerChoose();
	//Now, let's play, and return the result text!
	$returnText = "The server chose $computerChoice. ";
	$result = compare($userChoice, $computerChoice);
	if($result == 0) {
	$returnText .= 'The result is a Tie!';
	} else if($result == 1) {
	$returnText .= 'You won!';
	} else {
	$returnText .= 'The server won!';
	}
	}

	?>

	<!DOCTYPE html>
	<html>
	<head><title>Experiment</title></head>
	<body>
	<h1>Rock, Paper, Scissors in PHP</h1>
	<form method="GET">
	<select name="userSelect">
	<option value="rock" <?php echo isSelected('rock'); ?> >Rock</option>
	<option value="paper" <?php echo isSelected('paper'); ?> >Paper</option>
	<option value="scissors" <?php echo isSelected('scissors'); ?> >Scissors</option>
	</select>
	<input type="submit" value="Play"></input>
	</form>
	<p><?php echo $returnText; ?></p>
	</body>
	</html>

	<?php
	/**
	* Returns TRUE when the user has sent a valid selection
	*/
	function userHasValidSelection() {
	return isset($_GET['userSelect']) && in_array($_GET['userSelect'], ["rock", "paper", "scissors"]);
	}

	/**
	* returns the text selected if the user has sent a query var and $choice equals the value of the queryvar
	*/
	function isSelected($choice) {
	if (isset($_GET['userSelect']) && $_GET['userSelect'] === $choice) {
	return 'selected';
	}
	}

	/**
	* Let the computer make a choice
	* Returns at random: "rock", "paper" or "scissors"
	*/
	function letComputerChoose() {
	$numberChoice = rand(0, 2);
	if ($numberChoice == 0) {
	return "rock";
	}
	if ($numberChoice == 1) {
	return "paper";
	}
	return "scissors";

	}

	/**
	* Compares two choices and returns a number representing the result:
	* 0 = the result is a Tie
	* 1 = $choice1 wins
	* 2 = $choice2 wins
	*/
	function compare($choice1, $choice2) {
	if ($choice1 === $choice2) {
	return 0;
	}
	if ($choice1 === 'rock') {
	if ($choice2 === 'scissors') {
	return 1;
	} else {
	return 2;
	}
	}
	if ($choice1 === 'paper') {
	if ($choice2 === 'rock') {
	return 1;
	} else {
	return 2;
	}
	}
	if ($choice1 === 'scissors') {
	if ($choice2 === 'paper') {
	return 1;
	} else {
	return 2;
	}
	}
	}
	?>