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In general, filenames are underscored, while classnames are CamelCased. The class KissesAndHugsController can be found in the file kisses_and_hugs_controller.php, for example.

The name of the class a file holds may not necessarily be found in the filename, however. The class EmailComponent is found in a file named email.php, and the class HtmlHelper is found in a file named html.php.