Cassidoo | Guessing Game

README.md

Solution to Cassidoo's Week of Aug 21, 2023 Challenge

Make a "guessing game" where there is a target number, and as the user makes guesses, the output returns higher or lower until the user is correct.

I haven't messed with PHP's CLI handling of user input in a while, so I decided to stay focused on my language of 'choice'.

Went a little above the basic request, allowing users to override the min/max range. Available commands

$ php guessing-game.php
$ php guessing-game.php help
$ php guessing-game.php [min] [max]
$ php guessing-game.php [max]

Technically also works in shell more directly as well... provided you make sure it's executable, have php located at /usr/bin/php, and likely more situations not directly encountered today while writing this out.

$ ./guessing-game.php
$ ./guessing-game.php help
$ ./guessing-game.php [min] [max]
$ ./guessing-game.php [max]

Defaults to a random number between 1 and 100, limited to positive integers.

guessing-game.php

#!/usr/bin/php
<?php

$input = fopen("php://stdin", "r");

$min = 1;
$max = 100;

if (isset($argv[1]) && $argv[1] == "help") {
	echo "A quick guessing game build in PHP!" . PHP_EOL . PHP_EOL;
	echo "Acceptable ways to run this game:" . PHP_EOL;
	echo "\t$ php guessing-game.php [min] [max]" . PHP_EOL;
	echo "\t$ php guessing-game.php [max]" . PHP_EOL;
	echo "\t$ php guessing-game.php help" . PHP_EOL;
	echo "\t$ php guessing-game.php" . PHP_EOL;
	exit;
}

if ($range = array_slice($argv, 1)) {
	if (count($range) >= 2) {
		$min = (int)$range[0];
		$max = (int)$range[1];
	} else {
		$max = (int)$range[0];
	}

	if (abs($min) != $min || abs($max) != $max || $max <= 0 || $min <= 0) {
		echo "Please only enter positive, non-zero integers. Min: {$min} Max: {$max} provided" . PHP_EOL;
		exit;
	}

	if ($max <= $min) {
		echo "Invalid guessing range! Min: {$min} with Max: {$max} provided." . PHP_EOL;
		exit;
	}
}

$firstRun = true;
$numberToGuess = rand($min, $max);
$currentGuess = null;

echo "Guess the number!" . PHP_EOL;
$guessCount = 0;

while ($firstRun || $numberToGuess != $currentGuess) {
	$currentGuess = readline("> ");
	$guessCount++;
	$firstRun = false;

	if ($currentGuess != abs((int)$currentGuess) || $currentGuess == 0) {
		echo "Enter a positive, whole number between {$min} and {$max}" . PHP_EOL;
	} else if ($currentGuess < $numberToGuess) {
		echo "higher" . PHP_EOL;
	} else if ($currentGuess > $numberToGuess) {
		echo "lower" . PHP_EOL;
	}
}

echo "Correct! You won in {$guessCount} guesses!" . PHP_EOL;
echo "Let's play again!" . PHP_EOL;