check posix_isatty callable

src/Worker.php

@@ -1254,7 +1254,7 @@ class Worker
             $STDOUT = \fopen(static::$stdoutFile, "a");
             $STDERR = \fopen(static::$stdoutFile, "a");
             // Fix standard output cannot redirect of PHP 8.1.8's bug
-            if (\posix_isatty(2)) {
+            if (\function_exists('posix_isatty') && \posix_isatty(2)) {
                 \ob_start(function ($string) {
                     \file_put_contents(static::$stdoutFile, $string, FILE_APPEND);
                 }, 1);