gen_stub: Unit test for stub escaped strings

Author: NattyNarwhal

ext/zend_test/test.stub.php

@@ -60,7 +60,7 @@ class _ZendTestClass implements _ZendTestInterface {
         public static int $staticIntProp = 123;
 
         /* If there's a problem with escapes in quotes in generated headers,
-	 * the generated header won't compile. */
+	 * the generated header won't compile. (tests/gh22169.phpt) */
         public static string $doubleQuoteEscaped = "BEGIN \n\r\t\v\e\f\\\$\"\101\x41\u{41} END";
         public static string $singleQuoteEscaped = 'BEGIN \n\r\t\v\e\f\\\$\"\101\x41\u{41} END';
         public static string $escapeInterpolated = "begin \$ \\$ end";

ext/zend_test/test_arginfo.h

@@ -0,0 +1,22 @@
+--TEST--
+GH-22169: Ensure escaped strings in stubs are valid
+--EXTENSIONS--
+zend_test
+--FILE--
+<?php
+
+// Avoid funny control characters in output...
+// "BEGIN "         424547494e20
+// "\n\r\t\v\e\f"   0a0d090b1b0c
+// "\\\$\""         5c2422
+// "\101\x41\u{41}" 414141
+// " END"           20454e44
+var_dump(bin2hex(_ZendTestClass::$doubleQuoteEscaped));
+var_dump(_ZendTestClass::$singleQuoteEscaped);
+var_dump(_ZendTestClass::$escapeInterpolated);
+?>
+--EXPECT--
+string(44) "424547494e200a0d090b1b0c5c242241414120454e44"
+string(43) "BEGIN \n\r\t\v\e\f\\\\$\"\101\x41\u{41} END"
+string(14) "begin $ \$ end"
+