Bug in checking if stty is in the system

[toggio]

I get this problem with Raspberry Pi (Minibian last version).
The script work correctly from CLI but stopped if invoked from web browser.
The apache error log show:
"PHP Fatal error: No stty availible, unable to run. in /var/www/html/PhpSerial.php on line 56"

The problem go away if i changed the line
if ($this->_exec("stty") === 0) {
with the old one:
if ($this->_exec("stty --version") === 0) {

[subexl]

This works for me too on Debian. Thanks