get_the_post_thumbnail( int|WP_Post $post = null, string|int[] $size = 'post-thumbnail', string|array $attr = '' ): string

Retrieves the post thumbnail.

Contents

Description

When a theme adds ‘post-thumbnail’ support, a special ‘post-thumbnail’ image size is registered, which differs from the ‘thumbnail’ image size managed via the Settings > Media screen.

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.

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Parameters

$post int|WP_Post Optional
Post ID or WP_Post object. Default is global $post.

Default: null

$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'.

Default: 'post-thumbnail'

$attr string|array Optional
Query string or array of attributes.

Default: ''

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Return

string The post thumbnail image tag.

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More Information

If the required add_theme_support( 'post-thumbnails' ); in the current theme’s functions.php file is attached to a hook, it must be must be called before the init hook is fired. The init hook may be too late for some features. If attached to a hook, it must be after_setup_theme.

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Source

File: wp-includes/post-thumbnail-template.php. View all references 

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|int[] $size    Requested image size. Can be any registered image size name, or
	 *                              an array of width and height values in pixels (in that order).
	 * @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 int          $post_thumbnail_id The post thumbnail ID.
		 * @param string|int[] $size              Requested image size. Can be any registered image size name, or
		 *                                        an array of width and height values in pixels (in that order).
		 */
		do_action( 'begin_fetch_post_thumbnail_html', $post->ID, $post_thumbnail_id, $size );

		if ( in_the_loop() ) {
			update_post_thumbnail_cache();
		}

		// Get the 'loading' attribute value to use as default, taking precedence over the default from
		// `wp_get_attachment_image()`.
		$loading = wp_get_loading_attr_default( 'the_post_thumbnail' );

		// Add the default to the given attributes unless they already include a 'loading' directive.
		if ( empty( $attr ) ) {
			$attr = array( 'loading' => $loading );
		} elseif ( is_array( $attr ) && ! array_key_exists( 'loading', $attr ) ) {
			$attr['loading'] = $loading;
		} elseif ( is_string( $attr ) && ! preg_match( '/(^|&)loading=/', $attr ) ) {
			$attr .= '&loading=' . $loading;
		}

		$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 int          $post_thumbnail_id The post thumbnail ID.
		 * @param string|int[] $size              Requested image size. Can be any registered image size name, or
		 *                                        an array of width and height values in pixels (in that order).
		 */
		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 int          $post_thumbnail_id The post thumbnail ID, or 0 if there isn't one.
	 * @param string|int[] $size              Requested image size. Can be any registered image size name, or
	 *                                        an array of width and height values in pixels (in that order).
	 * @param string|array $attr              Query string or array of attributes.
	 */
	return apply_filters( 'post_thumbnail_html', $html, $post->ID, $post_thumbnail_id, $size, $attr );
}

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Hooks

do_action( 'begin_fetch_post_thumbnail_html', int $post_id, int $post_thumbnail_id, string|int[] $size )

Fires before fetching the post thumbnail HTML.

do_action( 'end_fetch_post_thumbnail_html', int $post_id, int $post_thumbnail_id, string|int[] $size )

Fires after fetching the post thumbnail HTML.

apply_filters( 'post_thumbnail_html', string $html, int $post_id, int $post_thumbnail_id, string|int[] $size, string|array $attr )

Filters the post thumbnail HTML.

apply_filters( 'post_thumbnail_size', string|int[] $size, int $post_id )

Filters the post thumbnail size.

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Uses

Uses
Uses Description
wp_get_loading_attr_default() wp-includes/media.php

Gets the default value to use for a loading attribute on an element.
in_the_loop() wp-includes/query.php

Determines whether the caller is in the Loop.
get_post_thumbnail_id() wp-includes/post-thumbnail-template.php

Retrieves the post thumbnail ID.
update_post_thumbnail_cache() wp-includes/post-thumbnail-template.php

Updates cache for thumbnails in the current loop.
wp_get_attachment_image() wp-includes/media.php

Gets an HTML img element representing an image attachment.
apply_filters() wp-includes/plugin.php

Calls the callback functions that have been added to a filter hook.
do_action() wp-includes/plugin.php

Calls the callback functions that have been added to an action hook.
get_post() wp-includes/post.php

Retrieves post data given a post ID or post object.
Show 3 more uses Hide more uses

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Changelog

Changelog
Version Description
4.4.0 $post can be a post ID or WP_Post object.
2.9.0 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 14You must log in to vote on the helpfulness of this note
    Contributed by Codex —

    Styling Post Thumbnails
    Post Thumbnails are given a class “wp-post-image”. They also get a class depending on the size of the thumbnail being displayed. You can style the output with these CSS selectors:

    img.wp-post-image
	img.attachment-thumbnail
	img.attachment-medium
	img.attachment-large
	img.attachment-full

    You can also give Post Thumbnails their own class:

    // Give the Post Thumbnail a class "alignleft".
echo get_the_post_thumbnail( $post_id, 'thumbnail', array( 'class' => 'alignleft' ) );
  2. Skip to note 2 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 7You must log in to vote on the helpfulness of this note
    Contributed by Codex —

    Thumbnail Sizes
    The default image sizes of WordPress are “thumbnail”, “medium”, “large” and “full” (the size of the image you uploaded).
    These image sizes can be configured in the WordPress Administration Media panel under Settings > Media.
    Themes may also add “post-thumbnail”. This is how you can use these default sizes with get_the_post_thumbnail():

    // without parameter -> Post Thumbnail (as set by theme using set_post_thumbnail_size())
get_the_post_thumbnail( $post_id );                   

get_the_post_thumbnail( $post_id, 'thumbnail' );      // Thumbnail (Note: different to Post Thumbnail)
get_the_post_thumbnail( $post_id, 'medium' );         // Medium resolution
get_the_post_thumbnail( $post_id, 'large' );          // Large resolution
get_the_post_thumbnail( $post_id, 'full' );           // Original resolution

get_the_post_thumbnail( $post_id, array( 100, 100) ); // Other resolutions

    Register new image sizes for Post Thumbnails with: add_image_size().
    To set the default size for Post Thumbnails see: set_post_thumbnail_size().

  3. Skip to note 3 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 6You must log in to vote on the helpfulness of this note
    Contributed by Codex —

    Sample Usage

    <?php $pages = get_pages( array( 'child_of' => 1 ) ); ?> 
<ul>
	<?php foreach ( $pages as $page ) : ?>
		<li>
			<?php echo get_the_post_thumbnail( $page->ID, 'thumbnail' ); ?>
			<h1><?php echo apply_filters( 'the_title', $page->post_title, $page->ID ); ?></h1>
			<?php echo apply_filters( 'the_content', $page->post_content ); ?>
		</li>
	<?php endforeach; ?>
</ul>
  4. Skip to note 4 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 4You must log in to vote on the helpfulness of this note
    Contributed by Codex —

    Post Thumbnail Linking to the Post Permalink

    This example shows the 5 latest Post Thumbnails linked to their Post permalink.

    $posts = get_posts( array( 'posts_per_page' => 5 ) );
foreach ( $posts as $_post ) {
	if ( has_post_thumbnail( $_post->ID ) ) {
		echo '<a href="' . get_permalink( $_post->ID ) . '" title="' . esc_attr( $_post->post_title ) . '">';
		echo get_the_post_thumbnail( $_post->ID, 'thumbnail' );
		echo '</a>';
	}
}
  5. Skip to note 5 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 3You must log in to vote on the helpfulness of this note
    Contributed by Shaikh Muhammad Arif Uddin —

    Remove width and height attributes from the returning html

    get_the_post_thumbnail function produces html with img tag which includes width, height, src, class, alt and title attributes. The following code snippet is useful if someone wish to remove width and height attribute.

    This function provides 'post_thumbnail_html' filter before returning the html.

    add_filter( 'post_thumbnail_html', 'remove_thumbnail_width_height', 10, 5 );

function remove_thumbnail_width_height( $html, $post_id, $post_thumbnail_id, $size, $attr ) {
    $html = preg_replace( '/(width|height)=\"\d*\"\s/', "", $html );
    return $html;
}
  6. Skip to note 6 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 3You must log in to vote on the helpfulness of this note
    Contributed by jesperstender —

    You can set more than just classes –
    If you want to optimize your SrcSet values you can do something like this

     echo get_the_post_thumbnail($post->ID, 'WhateverSize-Large', array('title' => 'WhateverTitle', 'sizes' => '(max-width: 320px) 288px, (max-width: 375px) 343px, (max-width: 425px) 393px, (max-width: 540px) 493px, (max-width: 768px) 320px, (max-width: 999px) 435px, 288px'));

    etc.

    Normally in a grid, the srcset can go 100vw – which is sometimes way too big –
    this method lets you control that.

  7. Skip to note 7 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 2You must log in to vote on the helpfulness of this note
    Contributed by Codex —

    Post Thumbnail Linking to large Image Size
    This example links to the “large” Post Thumbnail image size and must be used within The Loop.

    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>';
	}
}
  9. Skip to note 9 content
    You must log in to vote on the helpfulness of this noteVote results for this note: -1You must log in to vote on the helpfulness of this note
    Contributed by joshcanhelp —

    Post thumbnails in a listing context are often linked to the content they’re representing. Instead of adding that every time, here is a filter you can add that will do it automatically based on an `$attr` passed in.

    /**
 * Link thumbnails to their posts based on attr
 *
 * @param $html
 * @param int $pid
 * @param int $post_thumbnail_id
 * @param int $size
 * @param array $attr
 *
 * @return string
 */

function wpdev_filter_post_thumbnail_html( $html, $pid, $post_thumbnail_id, $size, $attr ) {

	 if ( ! empty( $attr[ 'link_thumbnail' ] ) ) {

		$html = sprintf(
			'<a href="%s" title="%s" rel="nofollow">%s</a>',
			get_permalink( $pid ),
			esc_attr( get_the_title( $pid ) ),
			$html
		);
	 }

	return $html;
}

add_filter( 'post_thumbnail_html', 'wpdev_filter_post_thumbnail_html', 10, 5 );

    Just “add the above to your functions.php file” (there’s probably a better place for it) and use it like this in a template file:

     'my-custom-class', // classes
		'link_thumbnail' => TRUE, // yes please link my thumbnail
	]
);
?>

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