PHP is a server-side scripting language – a PHP script usually runs on a Web server and is processed by the PHP engine each time it’s run. A PHP script can be written using plain text and can be created with any text editor. For a Windows OS you can use notepad, and for a Unix-based OS you can use vi, nedit, emacs, or pico. PHP scripts are usually written using characters from the 7-bit ASCII character set.
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