silverstripe-textextraction/code/extractors/PDFTextExtractor.php

<?php

/**
 * Text extractor that calls pdftotext to do the conversion.
 * @author mstephens
 *
 */
class PDFTextExtractor extends FileTextExtractor {

	function isAvailable() {
		$bin = $this->bin('pdftotext');
		return (file_exists($bin) && is_executable($bin));
	}
	
	function supportedExtensions() {
		return array("pdf");
	}

	/**
	 * Accessor to get the location of the binary
	 * @param $prog
	 * @return unknown_type
	 */
	function bin($prog='') {
		if ($this->stat('binary_location')) $path = $this->stat('binary_location'); // By static from _config.php
		elseif (file_exists('/usr/bin/pdftotext'))  $path = '/usr/bin';                      // By searching common directories
		elseif (file_exists('/usr/local/bin/pdftotext')) $path = '/usr/local/bin';
		else $path = '.'; // Hope it's in path

		return ( $path ? $path . '/' : '' ) . $prog;
	}
	
	function getContent($path) {
		if (!$path) return ""; // no file
		exec(sprintf('%s "%s" - 2>&1', $this->bin('pdftotext'), $path), $content, $err);
		if($err) {
			throw new FileTextExtractor_Exception(sprintf(
				'PDFTextExtractor->getContent() failed for %s: %s',
				$path,
				implode('', $err)
			));
		}
		return implode('', $content);
	}
}

?>