Get a list of active Wordpress plugins, current versions and available versions

_plugins.php

<?php

//based on https://wordpress.stackexchange.com/a/298323/88160 but standalone

require_once('wp-load.php');
ini_set("memory_limit","512M");
//error_reporting(E_ALL);
//ini_set('display_errors', 1);


    // returns version of the plugin represented by $slug, from repository
    function getPluginVersionFromRepository($slug) {
        $url = "https://api.wordpress.org/plugins/info/1.2/?action=plugin_information&request[slugs][]={$slug}";
        $response = wp_remote_get($url); // WPOrg API call
        $plugins = json_decode($response['body']);

        // traverse $response object
        foreach($plugins as $key => $plugin) {
            if(!empty($plugin->version)){
                $version = $plugin->version;
            }
            else{
                $version = '-';
            }
        }
        return $version;
    }

    // dashboard widget's callback
    function activePluginsVersions() {
        $allPlugins = get_plugins(); // associative array of all installed plugins
        $activePlugins = get_option('active_plugins'); // simple array of active plugins

        // building active plugins table
        echo '<table width="100%">';
        echo '<thead>';
        echo '<tr>';
        echo '<th width="50%" style="text-align:left">Plugin</th>';
        echo '<th width="20%" style="text-align:left">currVer</th>';
        echo '<th width="20%" style="text-align:left">repoVer</th>';
        echo '</tr>';
        echo '</thead>';
        echo '<tbody>';

        // traversing $allPlugins array
        foreach($allPlugins as $key => $value) {
            if(in_array($key, $activePlugins)) { // display active only
                echo '<tr>';
                echo "<td>{$value['Name']}</td>";
                echo "<td>{$value['Version']}</td>";
                $slug = explode('/',$key)[0]; // get active plugin's slug

                // get newest version of active plugin from repository
                $repoVersion = getPluginVersionFromRepository($slug);

                echo "<td>{$repoVersion}</td>";
                echo '</tr>';
            }
        }
        echo '</tbody>';
        echo '</table>';
    }

 activePluginsVersions();