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shellscript open libreoffice on lxde

I have a TV with a raspberry attached to it. This raspberry is with PHP and Apache server, I can upload a file to it. The idea is to upload an exec ('libreoffice file.pptx uploaded << but I still can not do it anyway. If I do through the terminal in X, it works: PHP test.php < exec (' libreoffice ') ;

In PHP return this.

No protocol specified Error:
cannot open display: :0.0

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