When using the_post_thumbnail() or related functions, the ‘post-thumbnail’ image size is used by default, though a different size can be specified instead as needed.
Syntax:
1 2 | get_the_post_thumbnail( int|WP_Post $post = null, string|array $size = 'post-thumbnail', string|array $attr = '' ) |
Function definition:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | function get_the_post_thumbnail( $post = null, $size = 'post-thumbnail', $attr = '' ) { $post = get_post( $post ); if ( ! $post ) { return ''; } $post_thumbnail_id = get_post_thumbnail_id( $post ); /** * Filters the post thumbnail size. * * @since 2.9.0 * @since 4.9.0 Added the `$post_id` parameter. * * @param string|array $size The post thumbnail size. Image size or array of width and height * values (in that order). Default 'post-thumbnail'. * @param int $post_id The post ID. */ $size = apply_filters( 'post_thumbnail_size', $size, $post->ID ); if ( $post_thumbnail_id ) { /** * Fires before fetching the post thumbnail HTML. * * Provides "just in time" filtering of all filters in wp_get_attachment_image(). * * @since 2.9.0 * * @param int $post_id The post ID. * @param string $post_thumbnail_id The post thumbnail ID. * @param string|array $size The post thumbnail size. Image size or array of width * and height values (in that order). Default 'post-thumbnail'. */ do_action( 'begin_fetch_post_thumbnail_html', $post->ID, $post_thumbnail_id, $size ); if ( in_the_loop() ) { update_post_thumbnail_cache(); } $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr ); /** * Fires after fetching the post thumbnail HTML. * * @since 2.9.0 * * @param int $post_id The post ID. * @param string $post_thumbnail_id The post thumbnail ID. * @param string|array $size The post thumbnail size. Image size or array of width * and height values (in that order). Default 'post-thumbnail'. */ do_action( 'end_fetch_post_thumbnail_html', $post->ID, $post_thumbnail_id, $size ); } else { $html = ''; } /** * Filters the post thumbnail HTML. * * @since 2.9.0 * * @param string $html The post thumbnail HTML. * @param int $post_id The post ID. * @param string $post_thumbnail_id The post thumbnail ID. * @param string|array $size The post thumbnail size. Image size or array of width and height * values (in that order). Default 'post-thumbnail'. * @param string $attr Query string of attributes. */ return apply_filters( 'post_thumbnail_html', $html, $post->ID, $post_thumbnail_id, $size, $attr ); } |
get_the_post_thumbnail() function examples 1:
1 2 | // Give the Post_Thumbnail a class "alignleft". echo get_the_post_thumbnail( $post_id, 'post_thumbnail', array( 'class' =>; 'alignleft' ) ); |
get_the_post_thumbnail() function examples 2:
1 2 3 4 5 6 7 8 | if ( has_post_thumbnail() ) { $large_image_url = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'large' ); if ( ! empty( $large_image_url[0] ) ) { echo '<a href="' . esc_url( $large_image_url[0] ) . '" title="' . the_title_attribute( array( 'echo' => 0 ) ) . '">'; echo get_the_post_thumbnail( $post->ID, 'thumbnail' ); echo '</a>'; } } |
Reference: https://developer.wordpress.org/reference/functions/get_the_post_thumbnail/
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