I’ve listed out some related to PDF read and search resources down here for my future reference.
- http://www.re-cycledair.com/search-pdf-php-mysql-pdftotext
- https://php.livejournal.com/295413.html
- https://davidwalsh.name/read-pdf-doc-file-php
- http://www.fpdf.org/
- http://www.sphider.eu/
- https://www.setasign.com/products/fpdi/about
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