Episode 214 Coding Challenge in dominucco's Favorite Language

blackjack.php

<?php

// Usage: php blackjack.php 10 A,9
// Output: Stand

// Lookup tables
$lkp_dealer = ['2', '3', '4', '5', '6', '7', '8', '9', '10', 'A'];

$lkp_user = [
    '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', 'A,2', 'A,3', 'A,4', 'A,5', 'A,6', 
    'A,7', 'A,8', 'A,9', '2,2', '3,3', '4,4', '5,5', '6,6', '7,7', '8,8', '9,9', '10,10', 'A,A',
];

$lkp_strategy = [
    'H' => 'Hit',
    'S' => 'Stand',
    'D' => 'Double, otherwise Hit',
    'DS' => 'Double, otherwise Stand',
    'SP' => 'Split',
    'XH' => 'Surrender, otherwise Hit',
    'XP' => 'Surrender, otherwise Split',
    'XS' => 'Surrender, otherwise Stand',
];

// Read in our strategy chart
$lkp_chart = array_map('str_getcsv', file('chart.csv'));

// Assign arguments to variables with clearer names
$input_dealer = $argv[0];
$input_user = $argv[1];

// If the user input arguments exist in our lookup tables
if ($key_dealer = array_search($input_dealer, $lkp_dealer) && $key_user = array_search($input_user, $lkp_user)) {
    echo $lkp_strategy[$lkp_chart[$lkp_dealer[$key_dealer]][$lkp_user[$key_user]]];
} else {
    echo 'Invalid combination.';
}

chart.csv