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Finding out which fonts where used in PDF in PHP using free API:

<?php
$url = 'http://server.com/document.pdf';
$data = json_decode(file_get_contents('http://api.rest7.com/v1/pdf_info.php?url=' . $url));

if (@$data->success !== 1)
{
    die('Failed');
}
echo '<pre>';
print_r($data->fonts);