Migrazione Blogger- Wordpress 1

  <?php

    function labnol_blogger_query_vars_filter( $vars ) {
    $vars[] = "blogger";
    return $vars;
    }

    add_filter('query_vars', 'labnol_blogger_query_vars_filter');

    function labnol_blogger_template_redirect() {
    global $wp_query;
    $blogger = $wp_query->query_vars['blogger'];
    if ( isset ( $blogger ) ) {
    wp_redirect( labnol_get_wordpress_url ( $blogger ) , 301 );
    exit;
    }
    }

    add_action( 'template_redirect', 'labnol_blogger_template_redirect' );

    function labnol_get_wordpress_url($blogger) {
    if ( preg_match('@^(?:https?://)?([^/]+)(.*)@i', $blogger, $url_parts) ) {
    $query = new WP_Query (
    array ( "meta_key" => "blogger_permalink", "meta_value" => $url_parts[2] ) );
    if ($query->have_posts()) {
    $query->the_post();
    $url = get_permalink();
    }
    wp_reset_postdata();
    }
    return $url ? $url : home_url();
    }

    ?>