mysqli_query()函数返回值怎么使用？

$query="select * from video";

            $result=mysqli_query($db,$query);

            if($result)

            {

              if(mysqli_num_rows($result))

              {

                $result_array = mysql_fetch_array($result);

                if($result_array)

                {

                  foreach($result_array as $result_row)

                  {

                    ?>

                    <div class="col-lg-4">

                      <img class="img-circle" src="<?php $result_row.picture_path?>" alt="Generic placeholder image">

                      <h2><?php $result_row.videoName?></h2>

                      <p><a class="btn btn-default" href="#" role="button">View details »</a></p>

                    </div><!-- /.col-lg-4 -->

                    <?php

                  }

                }

              }

            }