PubMed Commons API

pubmed-commons.php

<?php

if (isset($_GET['pmid'])) {
  $json = file_get_contents('http://www.ncbi.nlm.nih.gov/myncbi/comments/?' . http_build_query(array(
    'p$rq' => 'CommL.CommServer:com',
    'cmd' => 'get',
    'recid' => $_GET['pmid'],
  )));

  $data = json_decode($json, true);

  $items = array();

  if ($data['comments']) {
    libxml_use_internal_errors(true);
    $doc = new DOMDocument();
    $doc->loadHTML($data['comments'], LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD | LIBXML_NOENT);

    $xpath = new DOMXPath($doc);
    $nodes = $xpath->query('//li');

    foreach ($nodes as $node) {
      $items[] = array(
        'id' => $node->getAttribute('data-cmid'),
        'date' => $xpath->evaluate('string(//*[contains(@class, "comm_date_d")])', $node),
        'text' => $xpath->evaluate('string(//*[contains(@class, "comm_content")])', $node),
        'url' => 'http://www.ncbi.nlm.nih.gov' . $xpath->evaluate('string(//*[contains(@class, "comm_permalink")]/@href)', $node),
        'author' => array(
          'name' => $xpath->evaluate('string(//*[contains(@class, "comm_f_name")])', $node),
          'comments' => 'http://www.ncbi.nlm.nih.gov' . $xpath->evaluate('string(//*[contains(@class, "comm_f_name")]/@href)', $node),
        ),
      );
    }
  }
} else {
  $json = file_get_contents('http://eutils.be-md.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?' . http_build_query(array(
    'db' => 'pubmed',
    'retmode' => 'json',
    'retmax' => 100000,
    'term' => 'has_user_comments[filter]'
  )));

  $data = json_decode($json, true);

  $items = array_map(function($id) {
    return 'http://www.macropus.org/2015/pubmed-commons/?pmid=' . $id;
  }, $data['esearchresult']['idlist']);
}

header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');

print json_encode($items);