Convert data of WP-PostViews to fit custom page counter of Ghost

convert.php

<?php
/**
 * @Author: printempw
 * @Date:   2016-02-01 20:37:43
 * @Last Modified by:   prpr
 * @Last Modified time: 2016-02-01 22:10:06
 *
 * Configure your database connection info here.
 * $wp_conn for WordPress installation database,
 * $ghost_conn for which you place `post_views` table in.
 */
$wp_conn    = new mysqli('localhost', 'root', 'root', 'test');
$ghost_conn = new mysqli('localhost', 'root', 'root', 'ghost');

if ($wp_conn->connect_error) {
    die($wp_conn->connect_error);
}
if ($ghost_conn->connect_error) {
    die($ghost_conn->connect_error);
}

/**
 * Taverse wp_postmeta
 * Be careful if you have a BIG table
 * Do not run this script twice
 */
$sql = "SELECT * FROM `wp_postmeta` WHERE `meta_key`='views'";
$result = $wp_conn->query($sql);
while ($row = $result->fetch_array()) {
    $id   = $row['post_id'];
    $view = $row['meta_value'];
    // Get slug from wp_posts table
    $sql = "SELECT * FROM `wp_posts` WHERE `id`='$id'";
    $slug = $wp_conn->query($sql)->fetch_array()['post_name'];
    if (updateRecord($slug, $view, $ghost_conn)) {
        echo "Importing: { slug: ".$slug.", pv:".$view." }<br />";
    } else {
        echo "Ignored:   { slug: ".$slug.", pv:".$view." }<br />";
    }
}

function updateRecord($slug, $view, $conn) {
    $result = $conn->query("SELECT * FROM post_views WHERE slug='$slug'");
    if ($result->num_rows != 0) {
        // If slug exists in ghost post_views, update it
        $update_sql = "UPDATE post_views SET pv=pv+$view WHERE slug='$slug'";
        $conn->query($update_sql);
        return true;
    } else {
        $result = $conn->query("SELECT * FROM posts WHERE slug='$slug'");
        if ($result->num_rows != 0) {
            // If imported slug doesn't exist in ghost page_views table,
            // but in posts, then insert it.
            $sql = "INSERT INTO post_views(slug, pv) VALUES ('$slug', 1)";
            $conn->query($sql);
            // Recursion
            updateRecord($slug, $view, $conn);
        }
        // If imported slug is already removed
        return false;
    }
}