bulk_edit_posts

function bulk_edit_posts( $post_data = null ) {
	global $wpdb;

	if ( empty( $post_data ) ) {
		$post_data = &$_POST;
	}

	if ( isset( $post_data['post_type'] ) ) {
		$ptype = get_post_type_object( $post_data['post_type'] );
	} else {
		$ptype = get_post_type_object( 'post' );
	}

	if ( ! current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' === $ptype->name ) {
			wp_die( __( 'Sorry, you are not allowed to edit pages.' ) );
		} else {
			wp_die( __( 'Sorry, you are not allowed to edit posts.' ) );
		}
	}

	if ( -1 == $post_data['_status'] ) {
		$post_data['post_status'] = null;
		unset( $post_data['post_status'] );
	} else {
		$post_data['post_status'] = $post_data['_status'];
	}
	unset( $post_data['_status'] );

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' === $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$post_IDs = array_map( 'intval', (array) $post_data['post'] );

	$reset = array(
		'post_author',
		'post_status',
		'post_password',
		'post_parent',
		'page_template',
		'comment_status',
		'ping_status',
		'keep_private',
		'tax_input',
		'post_category',
		'sticky',
		'post_format',
	);

	foreach ( $reset as $field ) {
		if ( isset( $post_data[ $field ] ) && ( '' === $post_data[ $field ] || -1 == $post_data[ $field ] ) ) {
			unset( $post_data[ $field ] );
		}
	}

	if ( isset( $post_data['post_category'] ) ) {
		if ( is_array( $post_data['post_category'] ) && ! empty( $post_data['post_category'] ) ) {
			$new_cats = array_map( 'absint', $post_data['post_category'] );
		} else {
			unset( $post_data['post_category'] );
		}
	}

	$tax_input = array();
	if ( isset( $post_data['tax_input'] ) ) {
		foreach ( $post_data['tax_input'] as $tax_name => $terms ) {
			if ( empty( $terms ) ) {
				continue;
			}
			if ( is_taxonomy_hierarchical( $tax_name ) ) {
				$tax_input[ $tax_name ] = array_map( 'absint', $terms );
			} else {
				$comma = _x( ',', 'tag delimiter' );
				if ( ',' !== $comma ) {
					$terms = str_replace( $comma, ',', $terms );
				}
				$tax_input[ $tax_name ] = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
			}
		}
	}

	if ( isset( $post_data['post_parent'] ) && (int) $post_data['post_parent'] ) {
		$parent   = (int) $post_data['post_parent'];
		$pages    = $wpdb->get_results( "SELECT ID, post_parent FROM $wpdb->posts WHERE post_type = 'page'" );
		$children = array();

		for ( $i = 0; $i < 50 && $parent > 0; $i++ ) {
			$children[] = $parent;

			foreach ( $pages as $page ) {
				if ( (int) $page->ID === $parent ) {
					$parent = (int) $page->post_parent;
					break;
				}
			}
		}
	}

	$updated          = array();
	$skipped          = array();
	$locked           = array();
	$shared_post_data = $post_data;

	foreach ( $post_IDs as $post_ID ) {
		// Start with fresh post data with each iteration.
		$post_data = $shared_post_data;

		$post_type_object = get_post_type_object( get_post_type( $post_ID ) );

		if ( ! isset( $post_type_object )
			|| ( isset( $children ) && in_array( $post_ID, $children, true ) )
			|| ! current_user_can( 'edit_post', $post_ID )
		) {
			$skipped[] = $post_ID;
			continue;
		}

		if ( wp_check_post_lock( $post_ID ) ) {
			$locked[] = $post_ID;
			continue;
		}

		$post      = get_post( $post_ID );
		$tax_names = get_object_taxonomies( $post );
		foreach ( $tax_names as $tax_name ) {
			$taxonomy_obj = get_taxonomy( $tax_name );
			if ( isset( $tax_input[ $tax_name ] ) && current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
				$new_terms = $tax_input[ $tax_name ];
			} else {
				$new_terms = array();
			}

			if ( $taxonomy_obj->hierarchical ) {
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array( 'fields' => 'ids' ) );
			} else {
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array( 'fields' => 'names' ) );
			}

			$post_data['tax_input'][ $tax_name ] = array_merge( $current_terms, $new_terms );
		}

		if ( isset( $new_cats ) && in_array( 'category', $tax_names, true ) ) {
			$cats                       = (array) wp_get_post_categories( $post_ID );
			$post_data['post_category'] = array_unique( array_merge( $cats, $new_cats ) );
			unset( $post_data['tax_input']['category'] );
		}

		$post_data['post_ID']        = $post_ID;
		$post_data['post_type']      = $post->post_type;
		$post_data['post_mime_type'] = $post->post_mime_type;

		foreach ( array( 'comment_status', 'ping_status', 'post_author' ) as $field ) {
			if ( ! isset( $post_data[ $field ] ) ) {
				$post_data[ $field ] = $post->$field;
			}
		}

		$post_data = _wp_translate_postdata( true, $post_data );
		if ( is_wp_error( $post_data ) ) {
			$skipped[] = $post_ID;
			continue;
		}
		$post_data = _wp_get_allowed_postdata( $post_data );

		if ( isset( $shared_post_data['post_format'] ) ) {
			set_post_format( $post_ID, $shared_post_data['post_format'] );
		}

		// Prevent wp_insert_post() from overwriting post format with the old data.
		unset( $post_data['tax_input']['post_format'] );

		$updated[] = wp_update_post( $post_data );

		if ( isset( $post_data['sticky'] ) && current_user_can( $ptype->cap->edit_others_posts ) ) {
			if ( 'sticky' === $post_data['sticky'] ) {
				stick_post( $post_ID );
			} else {
				unstick_post( $post_ID );
			}
		}
	}

	return array(
		'updated' => $updated,
		'skipped' => $skipped,
		'locked'  => $locked,
	);
}