List App Pages

functions.php

<?php

  $args = array(
    'post_type'       => 'app_pages',
    'posts_per_page'  => -1,
    'orderby'         => 'title',
    'order'           => 'ASC'
  );

  $app_pages = new WP_Query( $args );
  $output = array();

  foreach($app_pages->posts as $i => $page) {

    //add some arbitrary text as a new field.  
    $page->newvar = "The index is {$i}";

    //add it to the output array
    $output[] = $page;

  }

  return $output;

?>