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File: /home/honghock/public_html/wp-content/plugins/ninja-tables/app/Services/PluginInstaller.php
<?php


namespace NinjaTables\App\Services;


if ( ! class_exists('Plugin_Upgrader')) {
    include_once ABSPATH . 'wp-admin/includes/plugin-install.php';
    include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
}

class PluginInstaller extends \Plugin_Upgrader
{

    /**
     * install plugin using provided api link
     *
     * @param $apiLink
     *
     * @return array|bool|\WP_Error
     */
    public function installPlugin($apiLink)
    {
        return $this->install($apiLink);
    }

}