item.json

<?php
//get and set url protocol
$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? 'https://' : 'http://';
//set and sanitize global variables for URL construction
$server = htmlentities(strip_tags($_SERVER['SERVER_NAME']));
$path = htmlentities(strip_tags(dirname($_SERVER['PHP_SELF'])));
$fileName = htmlentities(strip_tags(basename($_SERVER['SCRIPT_NAME'])));
$fileNameURI = htmlentities(strip_tags($_SERVER['REQUEST_URI']));
//get id variable from URL
$id = isset($_GET['id']) ? strip_tags((int)$_GET['id']) : null;

function readTime($text) {
  $words = str_word_count(strip_tags($text));
  $minutes = floor($words / 200);
  if($minutes != 0) {
    return $minutes;
  } else {
    return '< 1';
  }
}

//set header for json file and allow cross-domain requests
header('Content-type: application/json');
header("access-control-allow-origin: *");

//bring database parameters and functions onto page
include_once './meta/assets/dbconnect.inc';

//get data to generate chapter data
$query = 'SELECT * FROM schema_fiction.bodymatter WHERE id = '.$id;

$result = $dbconn->query($query) or die($dbconn->error.__LINE__);
if($result->num_rows > 0) {
  while($item = $result->fetch_object()) {
    $item_id = $item->id;
    $item_name = $item->name;
    $item_creator = $item->creator;
    $item_publisher = $item->publisher;
    $item_body = $item->text;
    $item_image = $item->image;
    $item_date_created = $item->dateCreated;
    $item_date_modified = $item->dateModified;
    $item_genre = $item->additionalType;
    $item_about = $item->additionalType2;
    $item_learning_resource_type = $item->learningResourceType;
    $item_language = $item->inLanguage;
    //estimate read time, set here for global use
    $readTime = readTime($item_body);

?>
<script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": "CreativeWork",
  "@id": "<?php echo $protocol.$server.$path; ?>/",
  "mainEntity": {
    "@type": "Book",
    "name": "Opsis: Literary Arts Journal at Montana State University (MSU)",
    "description": "Opsis is the literature and arts magazine of Montana State University",
    "image": "<?php echo $protocol.$server.$path; ?>/meta/img/opsis.png",
    "datePublished": "<?php echo $item_date_created; ?>",
    "inLanguage": "<?php echo $item_language; ?>",
    "genre": "Journals (Publications)",
    "learningResourceType": "<?php echo $item_learning_resource_type; ?>",
    "creator": {
      "@type": "Person",
      "name": "Multiple Authors"
    }
  },
  "Article": {
    "@type": "Article",
    "@id": "<?php echo $protocol.$server.$path; ?>/item/<?php echo $item_id; ?>",
    "name": "<?php echo $item_name; ?>",
    "author": {
      "@type": "Person",
      "name": "<?php echo $item_creator; ?>"
    },
    "image": "<?php echo addslashes($item_image); ?>",
    "articleBody": "<?php echo urlencode($item_body); ?>",
    "url": "<?php echo $protocol.$server.$path; ?>/item/<?php echo $item_id; ?>",
    "timeRequired": "PT<?php echo $readTime; ?>M",
    "datePublished": "<?php echo $item_date_created; ?>",
    "publisher": {
      "@type": "Organization",
      "name": "<?php echo $item_publisher; ?>"
    },
    "additionalType": "http://dbpedia.org/resource/<?php echo str_replace(' ', '_', $item_genre); ?>",
    "additionalType": "http://dbpedia.org/resource/<?php echo str_replace(' ', '_', $item_about); ?>",
    "potentialAction": {
      "@type": "ReadAction",
      "actionStatus": "PendingActionStatus",
      "target": {
        "@type": "EntryPoint",
        "urlTemplate": "<?php echo $protocol.$server.$path; ?>/item/<?php echo $item_id; ?>"
      }
    }
  },
  "publisher": {
    "@type": "Organization",
    "@id": "http://dbpedia.org/resource/Montana_State_University",  
    "name": "<?php echo $item_publisher; ?>",
    "sameAs": "http://dbpedia.org/resource/Montana_State_University"
  },
  "url": "<?php echo $protocol.$server.$path; ?>/"
}
</script>

<?php
  }
$result->close();
}
$dbconn->close();
?>