The get_the_post_thumbnail() WordPress PHP function retrieves the post thumbnail.
Usage
get_the_post_thumbnail($post, $size, $attr)
Example:
Input:
echo get_the_post_thumbnail($post_id, 'medium', array('class' => 'alignleft'));
Output:
<img src="your-image-url" alt="Post Thumbnail" class="alignleft wp-post-image" width="300" height="200">
Parameters
$post(int|WP_Post) (Optional): Post ID or WP_Post object. Default is global$post.$size(string|int) (Optional): Image size. Accepts any registered image size name or an array of width and height values in pixels (in that order). Default ‘post-thumbnail’.$attr(string|array) (Optional): Query string or array of attributes. Default: ”.
More information
See WordPress Developer Resources: get_the_post_thumbnail()
Examples
Display post thumbnail with default size
This example displays the post thumbnail using the default ‘post-thumbnail’ size.
echo get_the_post_thumbnail($post_id);
Display post thumbnail with custom size
This example displays the post thumbnail using a custom size of 200×200 pixels.
echo get_the_post_thumbnail($post_id, array(200, 200));
Display post thumbnail with additional class
This example displays the post thumbnail with the ‘alignleft’ class added.
echo get_the_post_thumbnail($post_id, 'medium', array('class' => 'alignleft'));
Display post thumbnail with alt attribute
This example displays the post thumbnail with a custom alt attribute.
echo get_the_post_thumbnail($post_id, 'medium', array('alt' => 'Custom alt text'));
Display post thumbnail within a loop
This example displays the post thumbnail for each post within a loop.
if (have_posts()) :
while (have_posts()) : the_post();
echo get_the_post_thumbnail(get_the_ID(), 'medium');
endwhile;
endif;