grapheme_substr

• Optional parameter added - #4: string $locale = ""

 grapheme_substr(
     string $string,
     int $offset,
-    ?int $length = null
+    ?int $length = null,
+    string $locale = ""
   ): string|false

• Return type added: string|false
• Parameter type added for parameter #1 ($string): string
• Parameter name of parameter #2 changed: $start to $offset
• Parameter type added for parameter #2 ($offset): int
• Parameter type added for parameter #3 ($length): ?int
• Parameter default value added for position #3 ($length): null

  grapheme_substr(
-     $string,
+     string $string,
-     $start,
+     int $offset,
-     $length
+     ?int $length = null
-   )
+   ): string|false