Output a CSV-formatted list of all Co-Authors Plus users

show-all-coauthors-as-csv.php

<?php

// N.B.: This probably only works on popula.com; I don't know what the Co-Authors Plus metadata situation is by default. ¯\_(ツ)_/¯

// Print a CSV-formatted list of all co-authors and their email addresses.
function output_all_coauthors_as_csv() {
  $coauthors = get_posts(array(
    'post_type'      => 'guest-author',
    'posts_per_page' => -1
  ));

  echo 'Name,Email<br>';
  foreach ($coauthors as $coauthor) {
    // Uncomment the next line to only show the ones with email addresses:
    // if ( empty(get_post_meta( $coauthor->ID, 'email', true ) ) ) { continue; }
    echo esc_html( get_post_meta( $coauthor->ID, 'cap-display_name', true ) ) . ',' . esc_html( get_post_meta( $coauthor->ID, 'email', true ) ) . "<br>";
  }
}

// Do it.
output_all_coauthors_as_csv();