Example without fig sources

[ppKrauss]

At tests/example.xml there are no image... So run example at test/index.php also without.

---

Alternative to send figs by git, and generalize the local build of an HTML, using fig's DOI... But need an PeerJ API to get image file from DOI-fig.

$xpath = new DOMXPath($document);
foreach($xpath->query('//fig|//table') as $e) {
    $id = $e->getAttribute('id');
    $out = "\n -- {$e->tagName} $id";
    foreach($xpath->query('.//graphic',$e) as $g) {
        $gfile = $g->getAttribute('xlink:href');
        print "$out\n\t file: $gfile";
        $out = '';
        if (file_exists(__DIR__.$gfile))
            print " OK!";
        else {
            $oid = $xpath->query('object-id[@pub-id-type="doi"]',$e)->item(0);
            if ($oid) {
                $doi = $oid->nodeValue;
                print " without file here, get it from DOI $doi...";
                $bin = file_get_contents("http://dx.doi.org/$doi");
                if ($bin) {
                    // OPS, WHERE THE API for get full-image!? 
                    // Example, DOI:10.7717/peerj.182/fig-1 must be transtated to
                    //  https://dfzljdn9uc3pi.cloudfront.net/2013/182/1/fig-1-2x.jpg
                    file_put_contents($gfile,$bin);
                    print " OK!";
                } else
                    print " ops, NO ONLINE FILE";
            } else
                print "... no DOI";
        }
    } // graphic
} // graphic-container