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wp-content/plugins/smart-slider-3/plugin.php

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+<?php
+
+use Nextend\SmartSlider3\Platform\SmartSlider3Platform;
+use Nextend\SmartSlider3\SmartSlider3Info;
+
+add_action('plugins_loaded', 'smart_slider_3_plugins_loaded', 30);
+
+function smart_slider_3_plugins_loaded() {
+
+    define('NEXTEND_SMARTSLIDER_3', dirname(__FILE__) . DIRECTORY_SEPARATOR);
+    define('NEXTEND_SMARTSLIDER_3_BASENAME', NEXTEND_SMARTSLIDER_3_FREE_BASENAME);
+    define('NEXTEND_SMARTSLIDER_3_SLUG', NEXTEND_SMARTSLIDER_3_FREE_SLUG);
+
+    require_once dirname(__FILE__) . '/Defines.php';
+    require_once(SMARTSLIDER3_LIBRARY_PATH . '/Autoloader.php');
+
+    SmartSlider3Platform::getInstance();
+
+    add_filter("plugin_action_links_" . NEXTEND_SMARTSLIDER_3_BASENAME, 'N2_SMARTSLIDER_3_UPGRADE_TO_PRO');
+    function N2_SMARTSLIDER_3_UPGRADE_TO_PRO($links) {
+
+        if (function_exists('is_plugin_active') && !is_plugin_active('nextend-smart-slider3-pro/nextend-smart-slider3-pro.php')) {
+            if (!is_array($links)) {
+                $links = array();
+            }
+            $params  = array(
+                'utm_source'   => 'plugin-list',
+                'utm_medium'   => 'smartslider-wordpress-free',
+                'utm_campaign' => 'smartslider3'
+            );
+            $links[] = '<a href="' . SmartSlider3Info::getProUrlPricing($params) . '" style="color:#04C018;font-weight:bold;" target="_blank">' . "Go Pro" . '</a>';
+        }
+
+        return $links;
+    }
+}