Coding standards
The Joomla! coding standards are based on the PEAR coding standards with some small variations. You can see the full details on the developer site at http://developer.joomla.org/5-policies/3-Joomla-Coding-Standards.html.
The first thing to note is that Joomla! uses tabs for indenting and not spaces. The encoding on files must be set to UTF-8, as some other languages need this encoding to display all the different characters, and it is important that Joomla! supports multiple languages.
The closing PHP tag ?> at the end of each file should be left off; your web server is going to automatically handle this, and by leaving it off, you prevent accidental whitespace.
Joomla! uses the Allman style for braces, so the opening brace is on ...
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