private function get_column_headers($omit_checkbox = true)
{
if (!empty($this->column_headers)) {
$headers = $this->column_headers;
} else {
// If we're nuking the existing columns, still provide checkboxes
if ($this->override) {
$headers = array('cb' => '<input type="checkbox" />');
} else {
// Cause infinite loops get boring after a while
remove_filter('manage_' . $this->post_type . '_posts_columns', array($this, 'column_headers'));
$this->load_list_table();
$list = new WP_Posts_List_Table();
$headers = $list->get_columns();
add_filter('manage_' . $this->post_type . '_posts_columns', array($this, 'column_headers'));
}
foreach ($this->columns as $key => $value) {
$headers[$key] = $value['name'];
}
$this->column_headers = $headers;
}
if ($omit_checkbox && isset($headers['cb'])) {
unset($headers['cb']);
}
return $headers;
}
/**
* Get WP default supported admin columns per post type.
*
* @since 1.0
*/
private function get_wp_default_posts_columns($post_type = 'post')
{
// You can use this filter to add thirdparty columns by hooking into this. See classes/third_party.php for an example.
do_action('cpac-get-default-columns-posts', $post_type);
// some plugins directly hook into get_column_headers, such as woocommerce
$columns = get_column_headers('edit-' . $post_type);
// get default columns
if (empty($columns)) {
// deprecated as of wp3.3
if (file_exists(ABSPATH . 'wp-admin/includes/template.php')) {
require_once ABSPATH . 'wp-admin/includes/template.php';
}
// introduced since wp3.3
if (file_exists(ABSPATH . 'wp-admin/includes/screen.php')) {
require_once ABSPATH . 'wp-admin/includes/screen.php';
}
// used for getting columns
if (file_exists(ABSPATH . 'wp-admin/includes/class-wp-list-table.php')) {
require_once ABSPATH . 'wp-admin/includes/class-wp-list-table.php';
}
if (file_exists(ABSPATH . 'wp-admin/includes/class-wp-posts-list-table.php')) {
require_once ABSPATH . 'wp-admin/includes/class-wp-posts-list-table.php';
}
// As of WP Release 3.5 we can use the following.
if (version_compare(get_bloginfo('version'), '3.4.10', '>=')) {
$table = new WP_Posts_List_Table(array('screen' => $post_type));
$columns = $table->get_columns();
} else {
// we need to change the current screen... first lets save original
$org_current_screen = $current_screen;
// prevent php warning
if (!isset($current_screen)) {
$current_screen = new stdClass();
}
// overwrite current_screen global with our post type of choose...
$current_screen->post_type = $post_type;
// ...so we can get its columns
$columns = WP_Posts_List_Table::get_columns();
// reset current screen
$current_screen = $org_current_screen;
}
}
if (empty($columns)) {
return false;
}
// change to uniform format
$columns = $this->get_uniform_format($columns);
// add sorting to some of the default links columns
$columns = $this->set_sorting_to_default_posts_columns($columns);
return $columns;
}
