🎉 Starts day 1

.gitignore

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+/.idea

add

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+#!/usr/bin/zsh
+
+SCRIPT_PATH="$( cd "$(dirname "$0")" ; pwd -P )"
+NUMBER=$1
+
+if [ ! -d "${SCRIPT_PATH}/day_${NUMBER}" ]; then
+  mkdir "${SCRIPT_PATH}/day_${NUMBER}"
+else
+  echo "folder ${SCRIPT_PATH}/day_${NUMBER} already exists"
+  exit
+fi
+
+cd "${SCRIPT_PATH}/day_${NUMBER}" || exit
+
+touch input.txt part_1.php part_2.php
+
+echo "DONE"
+
+exit

day_1/part_1.php

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+<?php
+
+$lines = array_filter(explode("\n", file_get_contents('./input.txt')), fn($line) => !empty($line));
+
+echo array_sum(array_map(
+    static function($line) {
+        $numbers = array_values(array_filter(array_map(static fn($letter) => is_numeric($letter) ? $letter : null, str_split($line))));
+
+        return (int) sprintf('%s%s', $numbers[0], array_pop($numbers));
+    },
+    $lines
+));