drupal php: ds custom field example code

snippet.php

<?php 

print_r($entity);
print_r($entity->field_attachment);

echo $entity->field_company_rl[LANGUAGE_NONE][0]['display_url'];
echo $entity->field_attachment[LANGUAGE_NONE][0]['uri'];

// Print url from uri if it's valid
$uri = $entity->field_attachment[LANGUAGE_NONE][0]['uri'];
if(!empty($uri)) {
  print file_create_url($uri);
}

// Check if module image exists
if(module_exists('image')) {
  // Check if image_field has value
  if(!empty($entity->field_image)) {
    //Pring image with medium image style
    $img_path = $entity->field_image[nn][0]['uri'];
    print theme_image_style(array("path" => $img_path, "style_name" => "medium");  
  }
}