fix: explode with empty separator in exemplar (#587)

Explode with empty separator errs: https://3v4l.org/RevTj Use mb_str_split instead: https://3v4l.org/VAKbR
exercism · Nov 28, 2023 · 44ea217 · 44ea217
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diff --git a/exercises/concept/city-office/.meta/exemplar/Form.php b/exercises/concept/city-office/.meta/exemplar/Form.php
@@ -9,7 +9,7 @@ function blanks(int $length): string
 
     function letters(string $word): array
     {
-        return explode("", $word);
+        return mb_str_split($word);
     }
 
     function checkLength(string $word, int $max_length): bool

diff --git a/exercises/concept/city-office/Form.php b/exercises/concept/city-office/Form.php
@@ -9,7 +9,7 @@ function blanks($length)
 
     function letters($word)
     {
-        return explode("", $word);
+        return mb_str_split($word);
     }
 
     function checkLength($word, $max_length)