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The File Header API consists of all functions and hooks that are part of the WordPress API regarding the use of File Headers. In WordPress Themes and Plugins consist of one or more files of which one has (Drop-Ins, Must-Use-Plugins: can have) so called File Headers containing meta-information (Name, Version, Author, ...) regarding the concrete Theme or Plugin.
File Headers are placed inside a block in the beginning of the file (not necessarily starting on the very first line), one header per line. A Header consists of a Name and a Value.