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function ExtractTextFromPdf ($pdfdata) {
    if (strlen ($pdfdata) < 1000 && file_exists ($pdfdata)) $pdfdata = file_get_contents ($pdfdata); //get the data from file
    if (!trim ($pdfdata)) echo "Error: there is no PDF data or file to process.";
    $result = ''; //this will store the results
    //Find all the streams in FlateDecode format (not sure what this is), and then loop through each of them
    if (preg_match_all ('/<<[^>]*FlateDecode[^>]*>>\s*stream(.+)endstream/Uis', $pdfdata, $m)) foreach ($m[1] as $chunk) {
        $chunk = gzuncompress (ltrim ($chunk)); //uncompress the data using the PHP gzuncompress function
        //If there are [] in the data, then extract all stuff within (), or just extract () from the data directly
        $a = preg_match_all ('/\[([^\]]+)\]/', $chunk, $m2) ? $m2[1] : array ($chunk); //get all the stuff within []
        foreach ($a as $subchunk) if (preg_match_all ('/\(([^\)]+)\)/', $subchunk, $m3)) $result .= join ('', $m3[1]); //within ()
    }
    else echo "Error: there is no FlateDecode text in this PDF file that I can process.";
    return $result; //return what was found
}