Fix Bug #55726 (Changing the working directory makes router script inaccessible)

sapi/cli/php_cli_server.c

@@ -1877,11 +1877,24 @@ static int php_cli_server_dispatch_router(php_cli_server *server, php_cli_server
 	}
 	{
 		zend_file_handle zfd;
+#if HAVE_BROKEN_GETCWD 
+		int old_cwd_fd = -1;
+		old_cwd_fd = open(".", 0);
+#else
+		char *old_cwd;
+		ALLOCA_FLAG(use_heap)
+#define OLD_CWD_SIZE 4096
+		old_cwd = do_alloca(OLD_CWD_SIZE, use_heap);
+		old_cwd[0] = '\0';
+		php_ignore_value(VCWD_GETCWD(old_cwd, OLD_CWD_SIZE-1));
+#endif
+
 		zfd.type = ZEND_HANDLE_FILENAME;
 		zfd.filename = server->router;
 		zfd.handle.fp = NULL;
 		zfd.free_filename = 0;
 		zfd.opened_path = NULL;
+
 		zend_try {
 			zval *retval = NULL;
 			if (SUCCESS == zend_execute_scripts(ZEND_REQUIRE TSRMLS_CC, &retval, 1, &zfd)) {
@@ -1893,6 +1906,18 @@ static int php_cli_server_dispatch_router(php_cli_server *server, php_cli_server
 				decline = 1;
 			}
 		} zend_end_try();
+
+#if HAVE_BROKEN_GETCWD
+		if (old_cwd_fd != -1) {
+			fchdir(old_cwd_fd);
+			close(old_cwd_fd);
+		}
+#else
+		if (old_cwd[0] != '\0') {
+			php_ignore_value(VCWD_CHDIR(old_cwd));
+		}
+		free_alloca(old_cwd, use_heap);
+#endif
 	}
 
 	if (decline) {