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With horstoeko/zugferd you can read and write xml files containing electronic invoice data in the Minimum-, Basic-, EN16931-, Extended- and XRechnung Profile. In addition, it is possible to attach the XML data to an existing PDF file, which was created from an ERP system, for example. If both an XML file (or XML string) and a PDF file (or a PDF in the form of a string) exist, then a compliant PDF file with attachment can be created using the ZugferdDocumentPdfMerger class.

The advantage of this library is that you don't have to worry about whether a particular XML element exists in a desired profile - you can use the same program code for all supported profiles.