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day1.php
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day1.php
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<?php
require_once('lib/lib.php');
// 1abc2
// pqr3stu8vwx
// a1b2c3d4e5f
// treb7uchet
// In this example, the calibration values of these four lines are 12, 38, 15, and 77.
// Adding these together produces 142.
$input = GetInput();
$inputLines = explode("\n", $input);
$numbers_1 = [];
$numbers_2 = [];
foreach($inputLines as $line) {
$numbers_1 []= GetDigitsFromStr((string) $line);
$convLine = ConvertToNumberArr((string)$line);
$number2 = reset($convLine);
end($convLine);
$number2 .= current($convLine);
$numbers_2 [] = $number2;
}
$result_1 = array_reduce($numbers_1, 'Sum');
$result_2 = array_reduce($numbers_2, 'Sum');
var_dump($result_1);
var_dump($result_2);
function Sum ($carry, $item) {
return (int)$carry + (int)$item;
}
function GetDigitsFromStr(string $inputString) : int {
$line = str_split($inputString);
$number = GetSingleDigit($line) . GetSingleDigit(array_reverse($line));
return $number;
}
function GetSingleDigit(array $chars) {
foreach($chars as $char) {
if (is_numeric($char) ){
return $char;
}
}
return 0;
}
function ConvertToNumberArr(String $line) {
$newStr = [];
$chars = str_split($line);
$numberStrWindow = "";
foreach($chars as $char) {
if (is_numeric($char) ){
$newStr []= $char;
$numberStrWindow = "";
continue;
}
$numberStrWindow .= $char;
$namedNumber = GetNamedNumber($numberStrWindow);
if($namedNumber != null) {
$newStr []= $namedNumber;
$numberStrWindow = substr($numberStrWindow, -1);
}
}
return $newStr;
}
function GetNamedNumber($str) : ?int {
return match (true) {
str_contains($str, "one") => 1,
str_contains($str, "two") => 2,
str_contains($str, "three") => 3,
str_contains($str, "four") =>4,
str_contains($str, "five") => 5,
str_contains($str, "six") => 6,
str_contains($str, "seven") =>7,
str_contains($str, "eight") => 8,
str_contains($str, "nine") =>9,
default => null
};
}