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Launching Xwindow application problem

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I want to launch Xwindow application through a PHP script. I use the shell_exec, exec functions. My apache2 runs with user and group www-data. I'm running Debian Linux (testing). I extracted the MIT-MAGIC-COOKIE from the user that launched Xserver to the .Xauthority of www-data user. When I "su" to www-data (su - www-data) and launch a xterm it will start. Doing this in a PHP script it won't start. I tried things like shell_exec("export DISPLAY=:0; xterm &), shell_exec("source ~/.bash_profile; xterm &"), but nothing...

This is something related with the apache environment?


Any help?



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