symfony · fabpot · Apr 2, 2018 · Mar 20, 2018
diff --git a/src/Symfony/Component/Console/Output/StreamOutput.php b/src/Symfony/Component/Console/Output/StreamOutput.php
@@ -81,17 +81,26 @@ protected function doWrite($message, $newline)
      *
      * Colorization is disabled if not supported by the stream:
      *
-     *  -  Windows != 10.0.10586 without Ansicon, ConEmu or Mintty
+     *  -  the stream is redirected (eg php file.php >log)
+     *  -  Windows without VT100 support, Ansicon, ConEmu, Mintty
      *  -  non tty consoles
      *
      * @return bool true if the stream supports colorization, false otherwise
      */
     protected function hasColorSupport()
     {
+        if (function_exists('stream_isatty') && !@stream_isatty($this->stream)) {
+            return false;
+        }
         if (DIRECTORY_SEPARATOR === '\\') {
+            if (function_exists('sapi_windows_vt100_support')) {
+                $vt100Enabled = @sapi_windows_vt100_support($this->stream);
+            } else {
+                $vt100Enabled = '10.0.10586' === PHP_WINDOWS_VERSION_MAJOR.'.'.PHP_WINDOWS_VERSION_MINOR.'.'.PHP_WINDOWS_VERSION_BUILD;
+            }
+
             return
-                function_exists('sapi_windows_vt100_support') && @sapi_windows_vt100_support($this->stream)
-                || '10.0.10586' === PHP_WINDOWS_VERSION_MAJOR.'.'.PHP_WINDOWS_VERSION_MINOR.'.'.PHP_WINDOWS_VERSION_BUILD
+                $vt100Enabled
                 || false !== getenv('ANSICON')
                 || 'ON' === getenv('ConEmuANSI')
                 || 'xterm' === getenv('TERM');