what is diference wp_get_attachment_url / wp_get_attachment_src / get_post_thumbnail_id?

There no WordPress function wp_get_attachment_src when you want to get answer you should clear your questions and also descriptive

I am giving you explanation of you question.
you what is difference wp_get_attachment_url / wp_get_attachment_src / get_post_thumbnail_id?

wp_get_attachment_url($id)

Returns a full URI for an attachment file or false on failure.
Here id is attachment post id

Example

echo wp_get_attachment_url( $id ); 
echo wp_get_attachment_url( 12 );
$example_url = wp_get_attachment_url( get_post_thumbnail_id() );
echo '<div style="background-image:url('.$example_url.');"></div>';

wp_get_attachment_image_src()

return array value of image attribute

Example

wp_get_attachment_image_src( int $attachment_id, string|array $size="thumbnail", bool $icon = false )

$image_attributes = wp_get_attachment_image_src( $attachment_id = 8 );
if ( $image_attributes ) : ?>
    <img src="https://wordpress.stackexchange.com/questions/261283/<?php echo $image_attributes[0]; ?>" width="<?php echo $image_attributes[1]; ?>" height="<?php echo $image_attributes[2]; ?>" />
<?php endif; ?>

get_post_thumbnail_id()
return featured image id

Example:

get_post_thumbnail_id($post_id)
$post_thumbnail_id = get_post_thumbnail_id( $post_id );

Now Solution of your problem

I guess $photo_id is your post id

<li><a data-image-id="'.$photo_id.'" href="'. get_permalink($photo_id).'">
<img data-image-id="'.$photo_id.'" class="thumbnail" src="'.get_the_post_thumbnail( $photo_id, 'thumbnail', array( 'class' => 'alignleft' ) );.'"></a>
</li>

for more information follow the codex:

get_post_thumbnail_id()

wp_get_attachment_image_src()

wp_get_attachment_url()

Related Posts:

  1. How do I use WP_query with multiple post IDs?
  2. Include WP_Query in my own PHP file?
  3. Inject post (from specific category) between posts in Loop
  4. is_page() not working from within a plugin
  5. Passing JSON data from WP Query into AJAX causing NULL errors
  6. AJAX / Read More: multiple check_ajax_referer() and wp_create_nonce() not working independentely
  7. Display certain amount of posts on taxonomy archive page
  8. Result of Custom WP_Query appears on 404 Page (but result are found!)
  9. Show only one post for each author ( Page loads too slow )
  10. how to display active, upcoming and past event with featured listing with pagination
  11. How to add 2 posts under another post? Formatting should be intact
  12. Modern Tribe Calendar wp-query with meta query not working at all
  13. if statement on database query
  14. WP_Query sort using multiple numeric meta values
  15. WordPress WP_Query() Not working properly
  16. How to get to a specific position in wp_query?
  17. Get category name from custom loop and echo it once
  18. API response to be stored locally
  19. WP_Query loop, does not display special characters in title correctly
  20. Remove query string specific key value
  21. Hide post if matches current month and year
  22. Use WP_Query in shortcode
  23. Why is variable not working on custom sql query using wpdb?
  24. Random order of WP_Query results with highest meta value
  25. Using foreach loop breaks
  26. Dynamic content based on a URL parameter
  27. Get users that likes the post
  28. inserting a post from an extern php file but post content doesn’t show on wp site
  29. Security for data obtained from the database
  30. Create a Blog Template Page
  31. Exclude posts with specific metadata from search?
  32. Display an image if odd number of posts in grid
  33. How to retrieve the data from the sever and displaying it in a page?
  34. How to overwrite orderby with add_query_var
  35. Why doesn’t PhotoSmash plugin play well with wp_query?
  36. get_the_ID() in the footer returns wrong value
  37. How to show meta value code HTML after x paragraph
  38. Form search query – displaying ACF “Post Object” field as results
  39. get_the_ID() doesnt work
  40. change the default order of posts only for specific categories
  41. extract serialized array to use for wp-query
  42. WP_Query multiple post results
  43. How can I split my query result in 2 arrays?
  44. echo var into wp_query
  45. How to get post category list as select in front-end?
  46. Order a WP_Query by meta value where the value is an array
  47. How do I check if there is a tag in the title
  48. Toolbar Hidden in a Virtual Page
  49. the_post(); prints out style text into my HTML?
  50. Wp Query : Order by distance lat,lon
  51. Let current user know pending posts counts using wp_query
  52. get_terms with specific id order
  53. “pre_get_posts” orderby custom date field in different format?
  54. WordPress Search Ajax + Isotope + InfiniteScroll
  55. get different meta-data of a complicated query at the same time
  56. Using a new WP_Query inside the loop
  57. wp_query – Exclude the first thumbnail from lazy loading on archives
  58. WordPress sorting posts by date and title using a dropdown
  59. How to get specific multiple pages excerpts at homepage?
  60. Usermeta data unserialize, extract and display in table in WordPress
  61. Query on a repeater date (acf)
  62. can I extend the WP_Query class to deal with ‘duplicate’ posts created by joining to wp_posts?
  63. Trying to get pagination working on WP_Query() post grid
  64. Check the database for a postmeta field
  65. Wp-query output correct, but the loop shows one less item (only sometimes)
  66. How to display sticky post always at the top (before regular post) in wordpress?
  67. Combine multiple queries, array_unique returns nothing
  68. How to display last whole post on the homepage
  69. wordpress query returning unexpected results
  70. Custom Post type Ajax search results
  71. Display only upcoming events / Show all events when archive year is selected
  72. wp_query beginner
  73. Transfer WordPress Login Session to an Extended Webpage on the Same Domain
  74. How can I display a query in a page?
  75. direct query to post_meta table
  76. Add post class in custom loop (WP_QUERY)
  77. WooCommerce – Print Processing orders [closed]
  78. List of child pages fetch next results at link click
  79. List sibling pages widget, exclude current page
  80. Why does WP_Query show only the same post even with different categories and endwhile?
  81. How to get category pages to look like a certain archive page?
  82. show/hide attachments
  83. reorder a WP_Query, using a dropdown
  84. Custom query_posts() parameter
  85. WP_Query based on another query on the page
  86. Does wp_query and query_posts affect website performance? [duplicate]
  87. WordPress post pagination on custom template not working
  88. Ajax Load More or View More functionality for woocommerce category layout by template overriding
  89. How to modify this function to exclude also the post belonging to a specific category?
  90. Show post like this image in my newssite [closed]
  91. Changing regular db connection to $wpdb
  92. Variable ++ in query loop
  93. XML WP_Query problem in PHP 8.0 and 8.1
  94. a problem in class in class-wp-hook.php
  95. How to initialise WP_Query on the basis of a specific meta_value and continue iterating rest?
  96. Count custom posts type and filter by tag
  97. AJAX WP_Query’s order and orderby parameters not working
  98. How to sort search result by post_title, then by post_content
  99. How do I display WooCommerce products in my query to rows of 3?
  100. How to get posts by a certain author in inner loop using outer loop variable or post title WordPress