#hakre memo: fixup! Update PrintfHelper.php

@phpstan-bot: perhaps you can spend some LLM-inference on the two comments, the earlier for feasibility, the later with your bets when this could happen.

Author: hakre

src/Rules/Functions/PrintfHelper.php

@@ -44,23 +44,29 @@ public function getPrintfPlaceholders(string $format): ?array
 	public function getScanfPlaceholdersCount(string $format): ?int
 	{
 		try {
+			// if we would *know* that simple downgrader can handle
+			// Throwable -> ErrorException then 7.4 required error
+			// handler could be injected this way into the try/catch
+			// & appending finally as an extension. *dreaming*
 			set_error_handler(
 				static function ($s, $m, ...$vv) {
 					$vv = array_slice($vv, 0, 2);
 					throw new ErrorException($m, 0, $s, ...$vv);
 				},
 			);
-			$nFormat = '%n' . $format;
+			$nFormat = '%*n' . $format;
 			$result = sscanf('', $nFormat);
 		} catch (Throwable) {
 			return null;
 		} finally {
 			restore_error_handler();
 		}
+		// one day phpstan may report here that $result can never be null for sscanf('', $nFormat),
+		// which is actually correct: https://3v4l.org/rO7Ni
 		if ($result === null) {
 			return null;
 		}
-		return count($result) + -1;
+		return count($result);
 	}
 
 	/**