HOW TO ADD OR GET MEDIA IMAGES IN WP.

u add media and featured image in post and u can get media image if media image add.

.firstly add this function in functions.php

function catch_that_image() {

  global $post, $posts;

  $first_img = '';

  ob_start();

  ob_end_clean();

  $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);

  $first_img = $matches[1][0];

  if(empty($first_img)) {

    $first_img = bloginfo(template_directory)."/images/download.jpg";  // this image used when                        //no image found

  }

  return $first_img;

}

Now this used where u want to add image .

if ( get_the_post_thumbnail($post_id) != '' ) {

 $large_image_url=wp_get_attachment_image_src(get_post_thumbnail_id(),'large');

  echo '<a href="'; the_permalink(); echo '" class="thumbnail-wrapper">';

  echo '<img src="';

 echo $large_image_url[0];

 echo '" alt=""  style="width:281px;height:154px;"/>';

 echo '</a>';

} else {

 echo '<a href="'; the_permalink(); echo '" class="thumbnail-wrapper">';

 echo '<img src="';

 echo catch_that_image();

 echo '" alt=""  style="width:281px;height:154px;"/>';

 echo '</a>';

}

OR

if ( get_the_post_thumbnail($post_id) != '' ) {

  echo '<a href="'; the_permalink(); echo '" class="thumbnail-wrapper">';

   the_post_thumbnail();

  echo '</a>';

} else {

 echo '<a href="'; the_permalink(); echo '" class="thumbnail-wrapper">';

 echo '<img src="';

 echo catch_that_image();

 echo '" alt="" />';

 echo '</a>';

}

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