Adds a native php extractor to search_api_attachments to support pdf extraction on environments where installing binaries is not possible. The php library used is smalot/pdfparser.

This is useful if you are not using solr (which can extract pdf contents) and can not install binaries on your hosting environment.

To use select the "Native PHP Extractor" on the search_api_attachments page at /admin/config/search/search_api_attachments and add the field to index as you normally would for search_api_attachments.