numguess.php

<?php

# Guess the number, input range, returns higher or lower

# get the number of games
# loop for each game
# get the range
# assign random number from range
# loop while user guesses
# if (sanitised) guess is too high or too low, say
# if (sanitised) guess is correct, next game

function sanitise($limit, $default) {
    $sanitised = false;
    $input = readline('> ');
    while (!$sanitised) {
        # If there are letters
        if (preg_match('/[a-z]/', $input)) {
            echo "No letters.\n";
            $input = readline('> ');
        # If there are symbols
        } elseif (preg_match('/[^\p{L}\d\s@#]/u', $input)) {
            echo "No symbols.\n";
            $input = readline('> ');
        # If there is no input
        } elseif ($input == null) {
            if ($default) {
                $input = $default;
                $sanitised = true;
            } else {
                echo "Enter a number.\n";
                $input = readline('> ');
            }
        } elseif (preg_match('/[0-9]/', $input)) {
            if ($limit) {
                if ($input < $limit) {
                    $sanitised = true;
                } else {
                    echo "Lower than $limit.\n";
                    $input = readline('> ');
                }
            } else {
                $sanitised = true;
            }
        }
    }
            
    return $input;
}

echo "Number of games (default 1):\n";
$games = sanitise(false, 1);

echo "Range to guess (default 10):\n";
$limit = sanitise(false, 10);

echo "Number $games limit $limit";