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To start using PHP, you can:
If your server is running PHP support you do not need to do anything.
Just create some .php files, place them in your web directory, and the server will automatically update them for you.
You do not need to add anything or install any additional tools.
Because PHP is free, most webmasters provide PHP support.
However, if your server does not support PHP, you should:
The official PHP website (PHP.net) has PHP installation instructions: http://php.net/manual/en/install.php