}
}
// bah humbug
return false;
}
// is it nice?
function is_nice($string)
{
// rule 1
if (!has_a_two_letter_pair($string)) {
return false;
}
// rule 2
if (!has_a_pair_with_one_char_between($string)) {
return false;
}
return true;
}
// load strings into array
$data = file('input/day-5.txt');
// count nice strings
$nice = 0;
// loop through strings
foreach ($data as $key => $str) {
// if string is "nice", increment counter
if (is_nice($str)) {
$nice++;
}
}
// output answer
echo 'Answer: ' . $nice;
function testIncrementPostfixExpressionOnFunctionPostfix($param)
{
return is_nice($param)++;
}
}
}
foreach ($cantMatchCountMap as $pattern) {
if (DEBUG) {
echo "\tTest NOT: {$pattern}: ";
}
$count = preg_match_all($pattern, $string);
if ($count > 0) {
if (DEBUG) {
echo "Failed", PHP_EOL;
}
return false;
}
if (DEBUG) {
echo "Passed", PHP_EOL;
}
}
return true;
}
// tests
assert(is_nice('qjhvhtzxzqqjkmpb'));
assert(is_nice('xxyxx'));
assert(!is_nice('uurcxstgmygtbstg'));
assert(!is_nice('ieodomkazucvgmuy'));
$contents = [];
$contents = file('input.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
$niceCount = 0;
foreach ($contents as $potential) {
is_nice($potential) ? ++$niceCount : null;
}
echo "{$niceCount} nice strings", PHP_EOL;
return true;
}
}
return false;
}
function has_pairs($string)
{
$chars = str_split($string);
foreach ($chars as $i => $char) {
if (isset($chars[$i + 1]) && strpos($string, $char . $chars[$i + 1], $i + 2) !== false) {
return true;
}
}
return false;
}
function is_nice2($string)
{
return has_pairs($string) && has_groups($string);
}
$lines = file(__DIR__ . '/input/5');
$lines = array_map('trim', $lines);
$count = 0;
$count2 = 0;
foreach ($lines as $line) {
$count += (int) is_nice($line);
$count2 += (int) is_nice2($line);
}
echo "part 1: ";
var_Dump($count);
echo "part 2: ";
var_Dump($count2);
