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File Content: `class-duplicate-me-admin.php`

<?php

/**
 * Exit if accessed directly.
 *
 * @package Duplicate Me
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Function creates post duplicate as a draft and redirects then to the edit post screen
 *
 * @package Duplicate Me
 * @since 3.0.0
 */
function duplicate_me_post_as_draft() {
	global $wpdb;
	if ( ! ( isset( $_GET['post'] ) || isset( $_POST['post'] ) || ( isset( $_REQUEST['action'] ) && 'duplicate_me_post_as_draft' == $_REQUEST['action'] ) ) ) {
		wp_die( 'No post to duplicate has been supplied!' );
	}

	/*
	 * Nonce verification
	 */
	if ( ! isset( $_GET['duplicate_nonce'] ) || ! wp_verify_nonce( $_GET['duplicate_nonce'], basename( __FILE__ ) ) ) {
		return;
	}

	/*
	 * get the original post id
	 */
	$post_id = ( isset( $_GET['post'] ) ? absint( $_GET['post'] ) : absint( $_POST['post'] ) );

	/* and all the original post data then  */

	$post = get_post( $post_id );

	/*
	 * if you don't want current user to be the new post author,
	 * then change next couple of lines to this: $new_post_author = $post->post_author;
	 */
	$current_user    = wp_get_current_user();
	$new_post_author = $current_user->ID;

	/* if post data exists, create the post duplicate */

	if ( isset( $post ) && null !== $post ) {

		/* New post data array */
		$args = array(
			'comment_status' => $post->comment_status,
			'ping_status'    => $post->ping_status,
			'post_author'    => $new_post_author,
			'post_content'   => $post->post_content,
			'post_excerpt'   => $post->post_excerpt,
			'post_name'      => $post->post_name,
			'post_parent'    => $post->post_parent,
			'post_password'  => $post->post_password,
			'post_status'    => 'draft',
			'post_title'     => $post->post_title,
			'post_type'      => $post->post_type,
			'to_ping'        => $post->to_ping,
			'menu_order'     => $post->menu_order,
		);

		/*
		 * insert the post by wp_insert_post() function
		 */
		$new_post_id = wp_insert_post( $args );

		/*
		 * get all current post terms ad set them to the new post draft
		 */
		$taxonomies = get_object_taxonomies( $post->post_type ); // returns array of taxonomy names for post type.
		foreach ( $taxonomies as $taxonomy ) {
			$post_terms = wp_get_object_terms( $post_id, $taxonomy, array( 'fields' => 'slugs' ) );
			wp_set_object_terms( $new_post_id, $post_terms, $taxonomy, false );
		}

		/*
		 * duplicate all post meta just in two SQL queries
		 */
		$post_meta_infos = $wpdb->get_results( "SELECT meta_key, meta_value FROM $wpdb->postmeta WHERE post_id=$post_id" );
		if ( count( $post_meta_infos ) !== 0 ) {
			$sql_query = "INSERT INTO $wpdb->postmeta (post_id, meta_key, meta_value) ";
			foreach ( $post_meta_infos as $meta_info ) {
				$meta_key = $meta_info->meta_key;
				if ( $meta_key == '_wp_old_slug' ) {
					continue;
				}
				$meta_value      = addslashes( $meta_info->meta_value );
				$sql_query_sel[] = "SELECT $new_post_id, '$meta_key', '$meta_value'";
			}
			$sql_query .= implode( ' UNION ALL ', $sql_query_sel );
			$wpdb->query( $sql_query );
		}

		/*
		 * Redirect to the edit post screen for the new draft
		 */
		wp_redirect( admin_url( 'post.php?action=edit&post=' . $new_post_id ) );
		exit;
	} else {
		wp_die( 'Post creation failed, could not find original post: ' . $post_id );
	}
}

/**
 * Duplicate post as draft
 */
function duplicate_me_page_as_draft() {
	global $wpdb;
	if ( ! ( isset( $_GET['page'] ) || isset( $_POST['page'] ) || ( isset( $_REQUEST['action'] ) && 'duplicate_me_page_as_draft' == $_REQUEST['action'] ) ) ) {
		wp_die( 'No page to duplicate has been supplied!' );
	}

	/*
	 * Nonce verification
	 */
	if ( ! isset( $_GET['duplicate_nonce'] ) || ! wp_verify_nonce( $_GET['duplicate_nonce'], basename( __FILE__ ) ) ) {
		return;
	}

	/*
	 * get the original post id
	 */
	$post_id = ( isset( $_GET['page'] ) ? absint( $_GET['page'] ) : absint( $_POST['page'] ) );
	/* and all the original post data then */
	$post = get_post( $post_id );

	/*
	 * if you don't want current user to be the new post author,
	 * then change next couple of lines to this: $new_post_author = $post->post_author;
	 */
	$current_user    = wp_get_current_user();
	$new_post_author = $current_user->ID;

	/* if post data exists, create the post duplicate */
	if ( isset( $post ) && null !== $post ) {

		/* new post data array */
		$args = array(
			'comment_status' => $post->comment_status,
			'ping_status'    => $post->ping_status,
			'post_author'    => $new_post_author,
			'post_content'   => $post->post_content,
			'post_excerpt'   => $post->post_excerpt,
			'post_name'      => $post->post_name,
			'post_parent'    => $post->post_parent,
			'post_password'  => $post->post_password,
			'post_status'    => 'draft',
			'post_title'     => $post->post_title,
			'post_type'      => $post->post_type,
			'to_ping'        => $post->to_ping,
			'menu_order'     => $post->menu_order,
		);

		/*
		 * insert the post by wp_insert_post() function
		 */
		$new_post_id = wp_insert_post( $args );

		/*
		 * get all current post terms ad set them to the new post draft
		 */
		$taxonomies = get_object_taxonomies( $post->post_type ); // returns array of taxonomy names for post type.
		foreach ( $taxonomies as $taxonomy ) {
			$post_terms = wp_get_object_terms( $post_id, $taxonomy, array( 'fields' => 'slugs' ) );
			wp_set_object_terms( $new_post_id, $post_terms, $taxonomy, false );
		}

		/*
		 * duplicate all post meta just in two SQL queries
		 */
		$post_meta_infos = $wpdb->get_results( "SELECT meta_key, meta_value FROM $wpdb->postmeta WHERE post_id=$post_id" );
		if ( count( $post_meta_infos ) != 0 ) {
			$sql_query = "INSERT INTO $wpdb->postmeta (post_id, meta_key, meta_value) ";
			foreach ( $post_meta_infos as $meta_info ) {
				$meta_key = $meta_info->meta_key;
				if ( $meta_key == '_wp_old_slug' ) {
					continue;
				}
				$meta_value      = addslashes( $meta_info->meta_value );
				$sql_query_sel[] = "SELECT $new_post_id, '$meta_key', '$meta_value'";
			}
			$sql_query .= implode( ' UNION ALL ', $sql_query_sel );
			$wpdb->query( $sql_query );
		}

		/*
		 * Redirect to the edit post screen for the new draft
		 */
		wp_redirect( admin_url( 'post.php?action=edit&post=' . $new_post_id ) );
		exit;
	} else {
		wp_die( 'Page creation failed, could not find original Page: ' . $post_id );
	}
}

/**
 * Redirect to the edit post screen for the new draft
 *
 * @param array   $actions An array of row action links. Default empty.
 * @param WP_Post $post    The post object.
 * @return array Modified array of row action links.
 */
function duplicate_me_post_link( $actions, $post ) {
	if ( current_user_can( 'edit_posts' ) ) {
		$actions['duplicate'] = '<a href="' . wp_nonce_url( 'admin.php?action=duplicate_me_post_as_draft&post=' . $post->ID, basename( __FILE__ ), 'duplicate_nonce' ) . '" title="Duplicate this item" rel="permalink">Duplicate Me</a>';
	}
	return $actions;
}

/**
 * Add the duplicate link to action list for post_row_actions
 *
 * @param array   $actions An array of row action links. Default empty.
 * @param WP_Post $post    The post object.
 */
function duplicate_me_page_link( $actions, $post ) {
	if ( current_user_can( 'edit_posts' ) ) {
		$actions['duplicate'] = '<a href="' . wp_nonce_url( 'admin.php?action=duplicate_me_post_as_draft&post=' . $post->ID, basename( __FILE__ ), 'duplicate_nonce' ) . '" title="Duplicate this item" rel="permalink">Duplicate Me</a>';
	}
	return $actions;
}
	// add action to perform clone to post.
	add_action( 'admin_action_duplicate_me_post_as_draft', 'duplicate_me_post_as_draft' );
	// add action to perform clone to page.
	add_action( 'admin_action_duplicate_me_page_as_draft', 'duplicate_me_page_as_draft' );
	// add action to add option to duplicate post.
	add_filter( 'post_row_actions', 'duplicate_me_post_link', 10, 2 );
	// add action to add option to duplicate page.
	add_filter( 'page_row_actions', 'duplicate_me_page_link', 10, 2 );
File Content: class-duplicate-me-admin.php

File Content: `class-duplicate-me-admin.php`
