Remove 'e' modifier for mb_ereg_replace()

This was deprecated in PHP 7.1 through
https://wiki.php.net/rfc/deprecate_mb_ereg_replace_eval_option.

Author: nikic

UPGRADING

@@ -72,6 +72,9 @@ PHP 8.0 UPGRADE NOTES
      * mbereg_search_getpos()  -> mb_ereg_search_getpos()
      * mbereg_search_setpos()  -> mb_ereg_search_setpos()
 
+  . The 'e' modifier for mb_ereg_replace() has been removed.
+    mb_ereg_replace_callback() should be used instead.
+
 - SPL:
   . SplFileObject::fgetss() has been removed.
 

ext/mbstring/php_mbregex.c

@@ -1043,7 +1043,8 @@ static void _php_mb_regex_ereg_replace_exec(INTERNAL_FUNCTION_PARAMETERS, OnigOp
 		}
 	}
 	if (eval && !is_callable) {
-		php_error_docref(NULL, E_DEPRECATED, "The 'e' option is deprecated, use mb_ereg_replace_callback instead");
+		php_error_docref(NULL, E_WARNING, "The 'e' option is no longer supported, use mb_ereg_replace_callback instead");
+		RETURN_FALSE;
 	}
 	if (Z_TYPE_P(arg_pattern_zval) == IS_STRING) {
 		arg_pattern = Z_STRVAL_P(arg_pattern_zval);

ext/mbstring/tests/bug43301.phpt

@@ -14,5 +14,5 @@ $var8 = mb_ereg_replace($var2,$var3,$var3,$var0);
 var_dump($var8);
 ?>
 --EXPECTF--
-Deprecated: mb_ereg_replace(): The 'e' option is deprecated, use mb_ereg_replace_callback instead in %s%ebug72164.php on line %d
-string(0) ""
+Warning: mb_ereg_replace(): The 'e' option is no longer supported, use mb_ereg_replace_callback instead in %s on line %d
+bool(false)