Related:

array(2) {
  ["_wp_attached_file"]=>
  array(1) {
    [0]=>
    string(16) "2011/05/nilo.jpg"
  }
  ["_wp_attachment_metadata"]=>
  array(1) {
    [0]=>
    string(656) "a:5:{s:5:"width";i:421;s:6:"height";i:500;s:4:"file";s:16:"2011/05/nilo.jpg";s:5:"sizes";a:2:{s:9:"thumbnail";a:4:{s:4:"file";s:16:"nilo-150x150.jpg";s:5:"width";i:150;s:6:"height";i:150;s:9:"mime-type";s:10:"image/jpeg";}s:6:"medium";a:4:{s:4:"file";s:16:"nilo-253x300.jpg";s:5:"width";i:253;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";}}s:10:"image_meta";a:12:{s:8:"aperture";s:1:"0";s:6:"credit";s:0:"";s:6:"camera";s:0:"";s:7:"caption";s:0:"";s:17:"created_timestamp";s:1:"0";s:9:"copyright";s:0:"";s:12:"focal_length";s:1:"0";s:3:"iso";s:1:"0";s:13:"shutter_speed";s:1:"0";s:5:"title";s:0:"";s:11:"orientation";s:1:"0";s:8:"keywords";a:0:{}}}"
  }
}

• Descriptors: