slider shortcode

<?php

/*
Plugin Name: Seo Toolkit

*/


/**
 * Enqueue plugin style-file
 */
function seo_toolkit_scripts() {
    // Respects SSL, Style.css is relative to the current file
    wp_register_style( 'seo-testimonials', plugins_url('/assets/css/testimonials.css', __FILE__) );
    wp_register_style( 'bootstrap', plugins_url('/assets/css/bootstrap.min.css', __FILE__) );
    wp_register_script( 'seo-slider-js', plugins_url('/assets/js/slider.js', __FILE__) );

}
add_action('init','seo_toolkit_scripts');



    add_action( 'init', 'seo_testimonial_post_type' );
    function seo_testimonial_post_type() {
        register_post_type( 'Testimonial',
        array(
          'labels' => array(
            'name' => __( ' Testimonials' ),
            'singular_name' => __( 'Testimonial' )
          ),
          'public' => true,
          'supports' => 'editor',
          'has_archive' => true,
        )
      );
    }



function seo_toolkit($atts, $content = null){
    extract(shortcode_atts(
    array(

        'img_url_link' => '',

    ),$atts

    ));

        //$img_url = plugins_url('/images/slider1.jpg', __FILE__);

    $list = '<div id="myCarousel" class="carousel slide">
                <ol class="carousel-indicators">
                    <li data-target="#myCarousel" data-slide-to="1"></li>
                    <li data-target="#myCarousel" data-slide-to="2"></li>
                </ol>
            <div class="carousel-inner">
                <div class="item active">';



    $list .=  '<div class="fill" style="background-image:url('.<?php plugins_url($img_url_link, __FILE__); ?>'.');'></div>';




    $list .=   '<div class="carousel-caption">
                    <h2>Caption 1</h2>
                </div>
                </div>
            <div class="item">';

    $list .=  '<div class="fill" style="background-image:url();"></div>
               <div class="carousel-caption">
                    <h2>Caption 2</h2>
                </div>
            </div>
    <div class="item">';

    $list .= '<div class="fill" style="background-image:url();"></div>';

    $list .=  '<div class="carousel-caption">
                    <h2>Caption 3</h2>
                </div>
            </div>
        </div>
        <a class="left carousel-control" href="#myCarousel" data-slide="prev">
            <span class="icon-prev"></span>
        </a>
        <a class="right carousel-control" href="#myCarousel" data-slide="next">
            <span class="icon-next"></span>
        </a>
    </div>';



    return $list;
}
    add_shortcode('slider','seo_toolkit');


?>