grapheme_strstr

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

 grapheme_strstr(
     string $haystack,
     string $needle,
-    bool $beforeNeedle = false
+    bool $beforeNeedle = false,
+    string $locale = ""
   ): string|false

• Return type added: string|false
• Parameter type added for parameter #1 ($haystack): string
• Parameter type added for parameter #2 ($needle): string
• Parameter name of parameter #3 changed: $before_needle to $beforeNeedle
• Parameter type added for parameter #3 ($beforeNeedle): bool
• Parameter default value added for position #3 ($beforeNeedle): false

  grapheme_strstr(
-     $haystack,
+     string $haystack,
-     $needle,
+     string $needle,
-     $before_needle
+     bool $beforeNeedle = false
-   )
+   ): string|false