pdf.php

	public function generatePdfFromHtml($html)	{
		$descriptorSpecification = array(
			0 => array('pipe', 'r'), // stdin
			1 => array('pipe', 'w'), // stdout
			2 => array('pipe', 'w'), // stderr
		);
		$process = proc_open($this->wkhtmltopdf . ' ' . implode(' ', $this->wkhtmltopdfParameters). ' - -',
			$descriptorSpecification, $pipes);

		fwrite($pipes[0], $html);
		fclose($pipes[0]);

		$pdf = stream_get_contents($pipes[1]);
		$errors = stream_get_contents($pipes[2]);

		fclose($pipes[1]);
		$returnCode = proc_close($process);

		if ($returnCode != 0 && $errors) {
			throw new \Exception('PDF generation failed: ' . $errors);
		}

		return $pdf;
	}