In biology, cell theory is a scientific theory which describes the properties of cells. These cells are the basic unit of structure in all organisms and also the basic unit of reproduction.
The doctype declaration should be the very first thing in an HTML document, before the <html> tag. The doctype declaration is not an HTML tag; it is an instruction to the web browser about what version of the markup language the page is written in. The doctype declaration refers to a Document Type Definition (DTD).
Load and parse objects and headers. Extract metadata (author, description, keywords, ...) Extract text from ordered pages. Support for compressed pdf (and not) Support of charset encoding (WinAnsi, MacRoman) Handling of hexa and octal content encoding. PSR-0 compliant (autoloader) Compatible with Composer.