Get Post Thumbnail By Post ID

You can use the has_post_thumbnail function to retrieve the post thumbnail by post ID in WordPress. Here’s an example code snippet:

<?php
$post_id = 123; // Replace 123 with your post ID

if (has_post_thumbnail($post_id)) {
    $thumbnail_id = get_post_thumbnail_id($post_id);
    $thumbnail_url = wp_get_attachment_image_src($thumbnail_id, 'thumbnail');

    // Display the thumbnail image
    echo '<img src="' . $thumbnail_url[0] . '" alt="Thumbnail">';
}
?>

In the above code, replace 123 with the actual post ID you want to retrieve the thumbnail for. The has_post_thumbnail() function checks if the post has a thumbnail, get_post_thumbnail_id() retrieves the ID of the thumbnail, and wp_get_attachment_image_src() returns the thumbnail URL based on the attachment ID and the desired image size (in this case, ‘thumbnail’).

You can adjust the wp_get_attachment_image_src() parameters to specify different image sizes such as ‘medium’, ‘large’, or a custom image size registered in your theme.