Fix Meetup exercise tests (#665)

Author: mk-mxp

exercises/practice/meetup/.meta/example.php

@@ -1,32 +1,10 @@
 <?php
 
-/*
- * By adding type hints and enabling strict type checking, code can become
- * easier to read, self-documenting and reduce the number of potential bugs.
- * By default, type declarations are non-strict, which means they will attempt
- * to change the original type to match the type specified by the
- * type-declaration.
- *
- * In other words, if you pass a string to a function requiring a float,
- * it will attempt to convert the string value to a float.
- *
- * To enable strict mode, a single declare directive must be placed at the top
- * of the file.
- * This means that the strictness of typing is configured on a per-file basis.
- * This directive not only affects the type declarations of parameters, but also
- * a function's return type.
- *
- * For more info review the Concept on strict type checking in the PHP track
- * <link>.
- *
- * To disable strict typing, comment out the directive below.
- */
-
 declare(strict_types=1);
 
-function meetup_day($year, $month, $which, $weekday)
+function meetup_day(int $year, int $month, string $which, string $weekday): DateTimeImmutable
 {
-    $monthName = DateTimeImmutable::createFromFormat("!m", $month)->format('F');
+    $monthName = DateTimeImmutable::createFromFormat("!m", "$month")->format('F');
     if ($which != "teenth") {
         return new DateTimeImmutable("$which $weekday of $monthName $year");
     }