Bulls and cows: Difference between revisions

=={{header|PHP}}==

<lang php><?php

$size = 4;

$chosen = implode(array_rand(range('1', '9'), $size));

echo "I've chosen a number from $size unique digits from 1 to 9; you need

to input $size unique digits to guess my number\n";

for ($guesses = 1; ; $guesses++) {

while (true) {

echo "\nNext guess [$guesses]: ";

$guess = rtrim(fgets(STDIN));

if (!checkguess($guess))

echo "$size digits, no repetition, no 0... retry\n";

else

break;

}

if ($guess == $chosen) {

echo "You did it in $guesses attempts!\n";

break;

} else {

$bulls = 0;

$cows = 0;

foreach (range(0, $size-1) as $i) {

if ($guess[$i] == $chosen[$i])

$bulls++;

else if (strpos($chosen, $guess[$i]) !== FALSE)

$cows++;

}

echo "$cows cows, $bulls bulls\n";

}

}

function checkguess($g)

{

$h = array();

foreach (str_split($g) as $k) {

if (array_key_exists($k, $h))

return false;

$h[$k] = 1;

}

return preg_match('/^[1-9]{4}$/', $g);

}

?></lang>