function _d3_list_library_versions_from_cdn in d3.js 7

Lists library versions by polling CDN

1 call to _d3_list_library_versions_from_cdn()

d3_config_form in ./d3.admin.inc

D3 configuration form

File

./d3.module, line 88

D3 module file for creating visualizations with d3.js.

Code

function _d3_list_library_versions_from_cdn() {
  $library_versions = array();
  if (checkdnsrr('d3js.org')) {
    stream_context_set_default(array(
      'https' => array(
        'method' => 'HEAD',
      ),
    ));
    for ($library_version = 3; $library_version < 50; ++$library_version) {
      $hdrs = get_headers("https://d3js.org/d3.v{$library_version}.min.js");
      if ($hdrs) {
        if (substr($hdrs[0], 9, 1) === '2') {
          $library_versions[] = "{$library_version}";
          continue;
        }
      }
      if (count($library_versions) != 0) {
        break;
      }
    }
    stream_context_set_default(array(
      'https' => array(
        'method' => 'GET',
      ),
    ));
  }
  return $library_versions;
}