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Trying to create my first test pdf failing with PHP

Aninemity
Hi. I've just downloaded and installed Prince and am trying to create my first test PDF.

Here's my code:

require_once dirname(__FILE__).'/prince.php';

$prince = new Prince('/usr/local/bin/prince');

$prince->setHTML(1);
$prince->setLog("/log.txt");
$prince->setPDFTitle("Test File");

$html = file_get_contents(dirname(__FILE__)."/out/test.html");

header('Content-Type: application/pdf');
header('Content-Disposition: attachment; filename="foo.pdf"');

$ret = $prince->convert_string_to_passthru($html);


The test.html file has this content:

<!DOCTYPE html>
<html>
<head></head>
<body>
	<h1>hello world!</h1>
</body>
</html>


The PDF is loading (if I use 'inline' instead of attachment), but it's a blank document. When I use 'attachment', the file is 0 bytes in size.

I can't figure out what I'm doing wrong here. Any ideas??
mikeday
Can you successfully run Prince manually from the command-line?

Is /log.txt created? Since / is probably not writable from PHP, perhaps try putting it in /tmp/log.txt?