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php: pdf to string

i am trying to save text content of pdf file in to DB. I found this link helpful Converting PDF to string, and worked on it. But it only converts very less amount of data 🙁 why is it so ?

Or any other solution on how to convert complex pdf file (containing header, footer, tables, nd two column layout in some pages etc etc.) in to string and save it to DB ?

Answer 1

A long time ago i wrote a script which download a pdf and convert it into text. This function do the convertion:

function pdf2string($sourcefile) {

$content = $sourcefile;

$searchstart = 'stream';
$searchend = 'endstream';
$pdfText = '';
$pos = 0;
$pos2 = 0;
$startpos = 0;

while ($pos !== false && $pos2 !== false) {

$pos = strpos($content, $searchstart, $startpos);
$pos2 = strpos($content, $searchend, $startpos + 1);

if ($pos !== false && $pos2 !== false){

if ($content[$pos] == 0x0d && $content[$pos + 1] == 0x0a) {
$pos += 2;
} else if ($content[$pos] == 0x0a) {
$pos++;
}

if ($content[$pos2 - 2] == 0x0d && $content[$pos2 - 1] == 0x0a) {
$pos2 -= 2;
} else if ($content[$pos2 - 1] == 0x0a) {
$pos2--;
}

$textsection = substr(
$content,
$pos + strlen($searchstart) + 2,
$pos2 - $pos - strlen($searchstart) - 1
);
$data = gzuncompress($textsection);
$pdfText .= pdfExtractText($data);
$startpos = $pos2 + strlen($searchend) - 1;

}
}

return preg_replace('/(\s)+/', ' ', $pdfText);

}

EDIT: I call pdfExtractText() This function is defined here:

function pdfExtractText($psData){

if (!is_string($psData)) {
return '';
}

$text = '';

// Handle brackets in the text stream that could be mistaken for
// the end of a text field. I'm sure you can do this as part of the
// regular expression, but my skills aren't good enough yet.
$psData = str_replace('\)', '##ENDBRACKET##', $psData);
$psData = str_replace('\]', '##ENDSBRACKET##', $psData);

preg_match_all(
'/(T[wdcm*])[\s]*(\[([^\]]*)\]|\(([^\)]*)\))[\s]*Tj/si',
$psData,
$matches
);
for ($i = 0; $i < sizeof($matches[0]); $i++) {
if ($matches[3][$i] != '') {
// Run another match over the contents.
preg_match_all('/\(([^)]*)\)/si', $matches[3][$i], $subMatches);
foreach ($subMatches[1] as $subMatch) {
$text .= $subMatch;
}
} else if ($matches[4][$i] != '') {
$text .= ($matches[1][$i] == 'Tc' ? ' ' : '') . $matches[4][$i];
}
}

// Translate special characters and put back brackets.
$trans = array(
'...' => '…',
'\205' => '…',
'\221' => chr(145),
'\222' => chr(146),
'\223' => chr(147),
'\224' => chr(148),
'\226' => '-',
'\267' => '•',
'\374'  => 'ü',
'\344'  => 'ä',
'\247'  => '§',
'\366'  => 'ö',
'\337'  => 'ß',
'\334'  => 'Ü',
'\326'  => 'Ö',
'\304'  => 'Ä',
'\(' => '(',
'\[' => '[',
'##ENDBRACKET##' => ')',
'##ENDSBRACKET##' => ']',
chr(133) => '-',
chr(141) => chr(147),
chr(142) => chr(148),
chr(143) => chr(145),
chr(144) => chr(146),
);
$text = strtr($text, $trans);

return $text;
}

EDIT2: To get content from a local file use:

$fp = fopen($sourcefile, 'rb');
$content = fread($fp, filesize($sourcefile));
fclose($fp);

EDIT3: Before saving data to db i use an escape function:

function escape($str)
{
$search=array("\\","\0","\n","\r","\x1a","'",'"');
$replace=array("\\\\","\\0","\\n","\\r","\Z","\'",'\"');
return str_replace($search,$replace,$str);
}