Datei drafts-for-friends.php:

<?php
/*
  Plugin Name: Drafts for Friends
  Plugin URI: https://wp-plugin-erstellen.de
  Version: 0.1.0
  Author: Florian Simeth
  Author URI: https://florian-simeth.de
  Description: Allows to create links to draft posts.
  Text Domain: drafts-for-friends
  Domain Path: /languages
  License: GPL
 */

add_action( 'admin_menu', 'dff_menus' );
 
 function dff_menus() {
 	add_submenu_page(
 		'edit.php',							# Eltern-Menü
 		__( 'Drafts for Friends', 'drafts-for-friends' ),	# Seitentitel
 		__( 'Drafts for Friends', 'drafts-for-friends' ),	# Menütitel
 		'manage_options',						# Benutzerrecht
 		'drafts-for-friends',						# Menü-Slug
 		'dff_settings_page_render'				# Funktionsname
 	);
 }

function dff_settings_page_render() {
	?>
    <div class="wrap">
        <h1><?php echo esc_html( get_admin_page_title() ); ?></h1>

		<?php
		include( plugin_dir_path( __FILE__ ) . '/templates/released-posts.php' );

		include( plugin_dir_path( __FILE__ ) . '/templates/new-draft-form.php' );
		?>

    </div>
	<?php
}

function dff_draft_select_options() {
	$query = new WP_Query( array(
		'post_type'   => 'post',
		'post_status' => 'draft',
		'meta_query'  => array(
			array(
				'key'     => 'dff_key',
				'compare' => 'NOT EXISTS',
			),
		),
	) );

	if ( $query->have_posts() ) {
		while ( $query->have_posts() ) {
			$query->the_post();
			printf(
				'<option value="%d">%s</option>',
				get_the_ID(),
				esc_attr( get_the_title() )
			);
		}
	} else {
		printf(
			'<option value="0">%s</option>',
			esc_attr__( 'No drafts found.', 'drafts-for-friends' )
		);
	}
}

Datei templates/new-draft-form.php:

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