daisho-update-2x-to-3x.php

<?php
/**
 * This function updates users that are using 2.x versions to
 * the 3.x versions.
 *
 * 1. The four project meta labels were removed and replaced with
 *    a single field that allows creating arbitrary labels.
 *    If user's post contains the old labels and the new custom field
 *    "daisho_project_meta" is empty, move the labels to this new field.
 *    This is run on every front-end and back-end post opening.
 */
function daisho_update_30() {
	global $post;

	if ( !is_object( $post ) ) {
		return;
	}

	$updates = array(
		'flow_post_description' => 'daisho_description',
		'flow_post_layout' => 'daisho_layout',
		'page_portfolio_loop_through' => 'browse_projects_in_selected_category',
	);

	if ( get_post_meta( $post->ID, 'flow_post_layout', true ) === 'no-sidebar' ) {
		delete_post_meta( $post->ID, 'flow_post_layout' );
	}

	foreach ( $updates as $key => $value ) {
		if ( !empty( get_post_meta( $post->ID, $key, true ) ) && empty( get_post_meta( $post->ID, $value, true ) ) ) {
			update_post_meta( $post->ID, $value, get_post_meta( $post->ID, $key, true ) );
			delete_post_meta( $post->ID, $key );
		}
	}

	$client = get_post_meta( $post->ID, 'portfolio_client', true );
	$date = get_post_meta( $post->ID, 'portfolio_date', true );
	$agency = get_post_meta( $post->ID, 'portfolio_agency', true );
	$ourrole = get_post_meta( $post->ID, 'portfolio_ourrole', true );
	$meta = '';
	$daisho_project_meta = get_post_meta( $post->ID, 'daisho_project_meta', true );
	$daisho_thumbnail_footer_text = get_post_meta( $post->ID, 'daisho_thumbnail_footer_text', true );

	if ( !empty( $date ) ) {
		$meta .= '[daisho-project-label label="Date"]' . $date . '[/daisho-project-label]' . "\n";
	}

	if ( !empty( $client ) ) {
		$meta .= '[daisho-project-label label="Client"]' . $client . '[/daisho-project-label]' . "\n";
	}

	if ( !empty( $agency ) ) {
		$meta .= '[daisho-project-label label="Agency"]' . $agency . '[/daisho-project-label]' . "\n";
	}

	if ( !empty( $ourrole ) ) {
		$meta .= '[daisho-project-label label="Our role" placement="right"]' . $ourrole . '[/daisho-project-label]';
	}

	if ( empty( $daisho_project_meta ) && !empty( $meta ) ) {
		update_post_meta( $post->ID, 'daisho_project_meta', $meta );
	}

	if ( empty( $daisho_thumbnail_footer_text ) && !empty( $client ) ) {
		update_post_meta( $post->ID, 'daisho_thumbnail_footer_text', $client );
	}

	return;
}
add_action( 'pre_get_posts', 'daisho_update_30' );