"where php code is to be written in linux "?

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http://www.linuxquestions.org – Hello i am using ubuntu 9.10 .AS in window for html code we normally write it in notepad and execute it in browers but now i am using ubuntu . i wanna to create my website with php ,please tell where the php code is written in ubuntu , and how to execute it means how i can check output of my written php code ??/// Thanks (HowTos)