ci-google-drive-pdf-thumbnail
This CodeIgniter's helper generates a PNG thumb from a PDF file using Google Drive thumbnail generator.
Its usage is recommended for CodeIgniter 2 or greater.
$this->load->helper('gpdf_thumb');
$pdf_file_url = "http://github-media-downloads.s3.amazonaws.com/GitHub.Quick.Facts.pdf";
$file_path = "./pdf_thumb.png";
saveGPDFThumb($pdf_file_url, $file_path);
// you can also set two more optional parameters
// - width (300 by default)
// - page number (1st by default)