PHP is a web script, but it is different from the html xml tag language. It can be opened directly through the browser. You need a PHP running environment to access and open the file. If Just edit PHP to open the file, just use (recommended learning: PHP video tutorial)
Notepad;
Dreamweaver;
EclipsePHP ;
editplus .
The way to open a php file using Notepad is to place the mouse on the php file:
Right click of the mouse - select open method - select notepad to open:
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