Hi. From http://research.compaq.com/SRC/virtu.../pstotext.html ...
pstotext is a program that works with Ghostscript (version 3.33 or later) to extract plain text from PostScript and PDF files (you should have Ghostscript 3.51 or later for PDF).
PHP version 4.2.2/3 seems to have issue with running exec pdftotext as in this thread, but I am not sure if pstotext would have the same problem.
The PHP strip_tags function was replaced with a regular expression in version 1.6.3. Version 1.8.0 should not index HTML tags.
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