diff --git a/add.sh b/add.sh
index df5c3ec..ee842d2 100755
--- a/add.sh
+++ b/add.sh
@@ -14,6 +14,9 @@ cd "${SCRIPT_PATH}/day_${NUMBER}" || exit
 
 touch input.txt part_1.php part_2.php
 
+echo -e "<?php\n\ninclude '../functions.php';\n\n" >> part_1.php
+echo -e "<?php\n\ninclude '../functions.php';\n\n" >> part_2.php
+
 echo "DONE"
 
 exit
diff --git a/functions.php b/functions.php
new file mode 100644
index 0000000..0c3f15d
--- /dev/null
+++ b/functions.php
@@ -0,0 +1,10 @@
+<?php
+
+function print_message(string|array $message)
+{
+    if (is_array($message)) {
+        $message = implode("\n", $message);
+    }
+
+    echo $message."\n";
+}
\ No newline at end of file