Reproduce bug 12629

Author: staabm

.github/workflows/e2e-tests.yml

@@ -322,6 +322,9 @@ jobs:
           - script: |
               cd e2e/bug-11819
               ../../bin/phpstan
+          - script: |
+              cd e2e/bug-12629
+              ../../bin/phpstan
 
     steps:
       - name: "Checkout"

e2e/bug-12629/phpstan-baseline.neon

@@ -0,0 +1,31 @@
+parameters:
+	ignoreErrors:
+		-
+			message: '#^Method Bug12629\\Bug12629\:\:is_macintosh_enc\(\) has no return type specified\.$#'
+			identifier: missingType.return
+			count: 1
+			path: src/bug-12629.php
+
+		-
+			message: '#^Method Bug12629\\Bug12629\:\:is_macintosh_enc\(\) has parameter \$s with no type specified\.$#'
+			identifier: missingType.parameter
+			count: 1
+			path: src/bug-12629.php
+
+		-
+			message: '#^Method Bug12629\\Bug12629\:\:is_macintosh_enc\(\) is unused\.$#'
+			identifier: method.unused
+			count: 1
+			path: src/bug-12629.php
+
+		-
+			message: '#^Regex pattern is invalid\: Compilation failed\: UTF\-8 error\: byte 2 top bits not 0x80 at offset 0 in pattern\: \!Ã\[€\-Ÿ\]\!u$#'
+			identifier: regexp.pattern
+			count: 1
+			path: src/bug-12629.php
+
+		-
+			message: '#^Regex pattern is invalid\: Compilation failed\: UTF\-8 error\: isolated byte with 0x80 bit set at offset 1 in pattern\: \!\[€\-Ÿ\]\!u$#'
+			identifier: regexp.pattern
+			count: 1
+			path: src/bug-12629.php

e2e/bug-12629/phpstan.neon

@@ -0,0 +1,7 @@
+includes:
+	- phpstan-baseline.neon
+
+parameters:
+	level: 8
+	paths:
+		- src

e2e/bug-12629/src/bug-12629.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Bug12629;
+
+class Bug12629 {
+	private function is_macintosh_enc($s) {
+
+		if(!is_string($s)) {
+			return false;
+		}
+
+		preg_match_all("![\x80-\x9f]!u", $s, $matchesMacintosh);
+		preg_match_all("!\xc3[\x80-\x9f]!u", $s, $matchesUtf8);
+
+		return count($matchesMacintosh[0]) > 0 && 0 == count($matchesUtf8[0]);
+	}
+}