[WordPress[ Extend Duplicate Content functions to create clones and identical post children

WP_extend_duplicate_content_create_clones_and_identical_children.php

<?php 

// Requires the duplicate_content() function
// https://gist.github.com/Jany-M/ba36a0499e4fb505105e

// Add link to create a cloned CHILD of this post, to action list for post_row_actions
function duplicate_content_link( $actions, $post ) {
	global $typenow;
	$user_id = get_current_user_id();
	$user_data = get_userdata($user_id);
	$user_role = $user_data->roles[0];
	
	// Manipulate user role based on something useful - not required, used later to check user Role
	$mod_role = str_replace('_author', '', $user_role);

	if ($post->post_type !== 'page' || $post->post_type !== 'post') {
		if (!get_post_ancestors($post) && current_user_can('edit_posts')) {
		  // this is not required, it only checks for a specific Role and uses it to determine if they are authorize to create posts in this custom post type
			if(current_user_can('edit_your-custom-post-type-slug-'.$mod_role.'s') && $typenow != 'your-custom-post-type-slug' || current_user_can('moderate_comments')) {
				$actions['duplicate'] = '<a href="admin.php?action=duplicate_content&amp;post=' . $post->ID . '&amp;post_parent='.$post->ID.'" title="By creating a Child from this post, this will become the parent" rel="permalink">Create Child</a>';
			}
		}
		
	}

	return $actions;
}
add_filter( 'page_row_actions', 'duplicate_content_link', 10, 2 );

// Add a button to create a cloned CHILD of this post, in the edit screen
function duplicate_content_button( $post ) {
	global $typenow;
    $my_custom_post_type_array = array('some-custom-post-type', 'another-custom-post-type');
	if(!get_post_ancestors($post) && in_array($typenow, $my_custom_post_type_array)) {
    	echo '<a href="admin.php?action=duplicate_content&amp;post=' . $post->ID . '&amp;post_parent='.$post->ID.'" title="By creating a Child from this post, this will become the parent" rel="permalink" id="duplicate_content_button" class="page-title-action">Create Child</a>';
    }
}
add_action( 'edit_form_top', 'duplicate_content_button', 10, 1 );

// Move the clone CHILD button somewhere nicer - requires an admin style.css
function duplicate_content_button_move() {
    ?>
    <script type="text/javascript">
        jQuery(document).ready( function($){
        	$('#duplicate_content_button').appendTo(".wrap h1");
        });     
    </script>
    <?php 
}
add_action( 'admin_head-post.php', 'duplicate_content_button_move' );
add_action( 'admin_head-post-new.php', 'duplicate_content_button_move' );

// Add the CLONE AS NEW duplicate link to action list for post_row_actions
function duplicate_clone_content_link( $actions, $post ) {
	global $typenow;
	$user_id = get_current_user_id();
	$user_data = get_userdata($user_id);
	$user_role = $user_data->roles[0];
	
	// Manipulate user role based on something useful - not required, used later to check user Role
	$mod_role = str_replace('_author', '', $user_role);
	
	if($post->post_parent != 0) {
		$post_parent = '&amp;post_parent='.get_post_ancestors($post)[0];
	} else {
		$post_parent = '';
	}

	if ($post->post_type !== 'page' || $post->post_type !== 'post') {
		if (current_user_can('edit_posts')) {
		  // this is not required, it only checks for a specific Role and uses it to determine if they are authorize to create posts in this custom post type
			if(current_user_can('edit_your-custom-post-type-slug-'.$mod_role.'s') && $typenow != 'your-custom-post-type-slug' || current_user_can('moderate_comments')) {
				$actions['clone'] = '<a href="admin.php?action=duplicate_content&amp;post='.$post->ID.''.$post_parent.'" title="You can clone this Post as a new one, they will be identical and you will be able to edit it" rel="permalink">Clone as New</a>';
			}
		}
		
	}

	return $actions;
}
add_filter( 'page_row_actions', 'duplicate_clone_content_link', 10, 2 );

// Add the CLONE AS NEW duplicate button in the edit screen
function duplicate_clone_content_button( $post ) {
	global $typenow;
	if($post->post_parent != 0) {
		$post_parent = '&amp;post_parent='.$post->ID;
	} else {
		$post_parent = '';
	}
  $my_custom_post_type_array = array('some-custom-post-type', 'another-custom-post-type');
	if(in_array($typenow, $my_custom_post_type_array)) {
    	echo '<a href="admin.php?action=duplicate_content&amp;post='.$post->ID.''.$post_parent.'" title="You can clone this Post as a new one, they will be identical and you will be able to edit it" rel="permalink" id="duplicate_clone_content_button" class="page-title-action">Clone as New</a>';
    }
}
add_action( 'edit_form_top', 'duplicate_clone_content_button', 10, 1 );

// Move the CLONE AS NEW duplicate button somewhere nicer
function duplicate_clone_content_button_move() {
    ?>
    <script type="text/javascript">
        jQuery(document).ready( function($){
        	$('#duplicate_clone_content_button').appendTo(".wrap h1");
        });     
    </script>
    <?php 
}
add_action( 'admin_head-post.php', 'duplicate_clone_content_button_move' );
add_action( 'admin_head-post-new.php', 'duplicate_clone_content_button_move' );

?>