PHL file suffix is associated with database applications (MySQL). File contains database configuration.
PHL file suffix is associated with PHP (Hypertext PreProcessor). PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. PHL file contains PHP source in ASCII format.
Icon Collection file.
File created by the Amazon Kindle e-reading device; stores Popular Highlights, which are sections or phrases within the eBook that have been highlighted by Kindle users; enables the gray dashed underline behavior for popularly marked items; saved in an XML format. Popular Highlights are provided to help users focus on the passages that are highlighted the most by all Kindle users. NOTE: To turn off Popular Highlights on a Kindle, select the information icon, choose Settings, and turn the Popular Highlights off.