Programming :: Can Php Script Execute X11 Applications

If I put

Code:

$r = exec('whoami');
echo $r;

into my php script, it works fine. However, if I put

Code:

$r = exec('myX11application');
echo $r;

it doesn't (to be precise, the script still works, but myX11application is not executed). Of course, scripts are run by user "apache", who doesn't have access to X11 server and doesn't even have DISPLAY variable defined.I installed virtual framebuffer Xvfb, created a small bash script:

Code:

Xvfb :2
export DISPLAY=:2
myX11application

and called it with exec from php, but it still doesn't run since it looks like Xvfb can't start if the normal X server is running (I need that for development purposes). The reported error from Xvfb is

Code:

(EE) config/hal: NewInputDeviceRequest failed (2)

Is there a solution to have php running your X11 applications with normal X server running?