taxi.php

<?php

function sanitise_num($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;
}

function sanitise_str() {
    $sanitised = false;
    $input = readline('> ');
    while (!$sanitised) {
        # If there are numbers
        if (preg_match('/[0-9]/', $input)) {
            echo "No numbers.\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) {
                echo "Enter a phrase.\n";
                $input = readline('> ');
        } elseif (preg_match('/[a-z]/', $input)) {
            $sanitised = true;
        }
    }
    return $input;
}

function sanitise_float() {
    $sanitised = false;
    $input = readline('> ');
    while (!$sanitised) {
        # If there are letters
        if (preg_match('/[a-z]/', $input)) {
            echo "No letters.\n";
            $input = readline('> ');
        # If there is no input
        } elseif ($input == null) {
                echo "Enter a phrase.\n";
                $input = readline('> ');
        } else {
            $sanitised = true;
        }
    }
    return $input;
}

function price($tarrif, $tarrifs, $distance, $distance_m) {
    # Additional charge is always 20p
    # Additional distance is always 86.9m

    $tarrif = $tarrifs[$tarrif];
    $price = $tarrif[0] * $distance;
    if ($distance_m > $tarrif[1]) {
        $price += $tarrif[2];
    }
    # Amount of 20ps to add
    $price += .2 * (($tarrif[3] - $tarrif[1]) / $tarrif[4]);
    # If longer than limit
    if ($distance_m > $tarrif[3]) {
        $price += .2 * (($tarrif[3] - $distance_m) / 86.9);
    }
    return $price;
}

$vehicles = [
    ['Small Car', 4],
    ['Large Car', 7],
    ['Minibus', 15]
];

$tarrifs = [
    /*
        per mile,
        initial distance,
        initial price,
        distance limit,
        pre-limit distance
    */
    [
        2.84,
        227.0,
        3.20,
        9647.5,
        113.5,
    ],
    [
        3.48,
        184.8,
        3.20,
        9609.6,
        92.4,
    ],
    [
        3.96,
        162.4,
        3.00,
        9581.6,
        81.2
    ]
];

# Get the number of passengers
echo "Enter the number of passengers.\n(if more than 15, please book separate taxis on subsequent use.)\n";
$passengers = sanitise_num(16, false);

# Assign vehicle based on size
# Loop through vehicles
for ($i = 0; $i < count($vehicles); $i++) {
    if ($i > 0) {
        # If passengers are less than or equal to the current but more than the last
        if ($passengers <= $vehicles[$i][1] && $passengers > $vehicles[$i-1][1]) {
            $chosen = $vehicles[$i][0];
        }
    # If first in array
    } else {
        # If passengers are less than or equal to the current
        if ($passengers <= $vehicles[$i][1]) {
            $chosen = $vehicles[$i][0];
        }
    }
}

echo "Is it a public holiday?\n";
$holiday = sanitise_str();
$holiday_bool = false;
while ($holiday_bool == false ) {
    if ($holiday == 'yes' || $holiday == 'no') {
        $holiday_bool = true;
    } else {
        echo "(Enter 'yes' or 'no')\n";
        $holiday = sanitise_str();
    }
}

if ($holiday == 'yes') {
    $holiday = true;
} else {
    $holiday = false;
}

echo "What day is it?\n";
$day = sanitise_str();
$day_bool = false;
$days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday', 'sunday', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'];
while ($day_bool == false) {
    if (in_array($day, $days)) {
        $day_bool = true;
    } else {
        echo "Enter a day in the format:\nMonday / monday / Mon / mon\n";
        $day = sanitise_str();
    }
}

$day = ' ' . $day;
if (strpos(strtolower($day), 'mon') != 0) {
    $day = 1;
} elseif (strpos(strtolower($day), 'tue') != 0) {
    $day = 2;
} elseif (strpos(strtolower($day), 'wed') != 0) {
    $day = 3;
} elseif (strpos(strtolower($day), 'thu') != 0) {
    $day = 4;
} elseif (strpos(strtolower($day), 'fri') != 0) {
    $day = 5;
} elseif (strpos(strtolower($day), 'sat') != 0) {
    $day = 6;
} elseif (strpos(strtolower($day), 'sun') != 0) {
    $day = 7;
}

echo "What hour is it (24 hour clock?)\n";
$time = readline('> ');
$time_bool = false;
while ($time_bool == false) {
    if ($time >= 0 && $time <= 24) {
        $time_bool = true;
    } else {
        echo "Enter the current hour in the 24 hour format (0-24)\n";
        $time = readline('> ');
    }
}

echo "Enter distance in miles.\n";
$distance = sanitise_float();
$distance_m = $distance * 1609.34;

# Distance over 6 miles
if ($distance > 6) {
    $price = $distance * 3.70;
# Monday-Friday 05:00-20:00, non holidays
} elseif (($day >= 1 && $day <= 5 && ($time > 5 && $time <= 20)) && !$holiday) {
    $tarrif = 0;
    $price = price(0, $tarrifs, $distance, $distance_m);
# Monday-Friday 20:00-22:00 or Saturday/Sunday 05:00-22:00
} elseif ((($day >= 1 && $day <= 5 && ($time > 20 && $time <= 22)) || ($day == 6 || $day == 7 && ($time > 5 && $time <= 20))) && !$holiday) {
    $price = price(1, $tarrifs, $distance, $distance_m);
# Any day 22:00-05:00 or on holidays
} elseif (($time > 22 || $time <= 5) || $holiday) {
    $price = price(2, $tarrifs, $distance, $distance_m);
}

echo "Number of passengers: $passengers\nVehicle used: $chosen\nDistance traveled: $distance miles / $distance_m metres\nPrice: £$price\n";