unable to open program using php [closed]

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I have tried all exec, system and all but i am not able to open notepad even. I am using XAMPP on Windows 7.

system("cmd /c notepad");

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Works here (notepad is opened), but you should realize two things:

• If you're running Apache as a service, you won't have a notepad windows pop up because the service will probably be running as another user in a non-interactive fashion.
• It's normal that you get no response for a long (perhaps indefinitely) because it will wait for the program to finish. See proc_open or popen for more control.