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ðŸ“ PHPMailer
ðŸ“ Requests
ðŸ“ SimplePie
ðŸ“ Text
ðŸ“„ admin-bar.php(33.55 KB)
ðŸ“ assets
ðŸ“„ atomlib.php(11.67 KB)
ðŸ“„ author-template.php(18.43 KB)
ðŸ“„ block-editor.php(23.61 KB)
ðŸ“„ block-i18n.json(316 B)
ðŸ“ block-patterns
ðŸ“„ block-patterns.php(15.07 KB)
ðŸ“ block-supports
ðŸ“„ block-template-utils.php(44.99 KB)
ðŸ“„ block-template.php(10.56 KB)
ðŸ“ blocks
ðŸ“„ blocks.php(50.69 KB)
ðŸ“„ bookmark-template.php(12.6 KB)
ðŸ“„ bookmark.php(15 KB)
ðŸ“„ cache-compat.php(5.83 KB)
ðŸ“„ cache.php(13.16 KB)
ðŸ“„ canonical.php(32.55 KB)
ðŸ“„ capabilities.php(39.06 KB)
ðŸ“„ category-template.php(55.67 KB)
ðŸ“„ category.php(12.4 KB)
ðŸ“ certificates
ðŸ“„ class-IXR.php(2.48 KB)
ðŸ“„ class-feed.php(529 B)
ðŸ“„ class-http.php(367 B)
ðŸ“„ class-json.php(42.66 KB)
ðŸ“„ class-oembed.php(401 B)
ðŸ“„ class-phpass.php(6.55 KB)
ðŸ“„ class-phpmailer.php(664 B)
ðŸ“„ class-pop3.php(20.48 KB)
ðŸ“„ class-requests.php(2.18 KB)
ðŸ“„ class-simplepie.php(95.78 KB)
ðŸ“„ class-smtp.php(457 B)
ðŸ“„ class-snoopy.php(36.83 KB)
ðŸ“„ class-walker-category-dropdown.php(2.42 KB)
ðŸ“„ class-walker-category.php(8.27 KB)
ðŸ“„ class-walker-comment.php(13.88 KB)
ðŸ“„ class-walker-nav-menu.php(9.35 KB)
ðŸ“„ class-walker-page-dropdown.php(2.64 KB)
ðŸ“„ class-walker-page.php(7.42 KB)
ðŸ“„ class-wp-admin-bar.php(17.08 KB)
ðŸ“„ class-wp-ajax-response.php(5.14 KB)
ðŸ“„ class-wp-application-passwords.php(11.97 KB)
ðŸ“„ class-wp-block-editor-context.php(1.32 KB)
ðŸ“„ class-wp-block-list.php(4.64 KB)
ðŸ“„ class-wp-block-parser.php(14.89 KB)
ðŸ“„ class-wp-block-pattern-categories-registry.php(5.25 KB)
ðŸ“„ class-wp-block-patterns-registry.php(8.15 KB)
ðŸ“„ class-wp-block-styles-registry.php(5.75 KB)
ðŸ“„ class-wp-block-supports.php(5.37 KB)
ðŸ“„ class-wp-block-template.php(1.8 KB)
ðŸ“„ class-wp-block-type-registry.php(4.56 KB)
ðŸ“„ class-wp-block-type.php(13.68 KB)
ðŸ“„ class-wp-block.php(8.21 KB)
ðŸ“„ class-wp-comment-query.php(46.55 KB)
ðŸ“„ class-wp-comment.php(9.13 KB)
ðŸ“„ class-wp-customize-control.php(25.22 KB)
ðŸ“„ class-wp-customize-manager.php(197.39 KB)
ðŸ“„ class-wp-customize-nav-menus.php(55.96 KB)
ðŸ“„ class-wp-customize-panel.php(10.42 KB)
ðŸ“„ class-wp-customize-section.php(10.98 KB)
ðŸ“„ class-wp-customize-setting.php(29.19 KB)
ðŸ“„ class-wp-customize-widgets.php(69.95 KB)
ðŸ“„ class-wp-date-query.php(34.84 KB)
ðŸ“„ class-wp-dependencies.php(13.73 KB)
ðŸ“„ class-wp-dependency.php(2.57 KB)
ðŸ“„ class-wp-editor.php(70.27 KB)
ðŸ“„ class-wp-embed.php(15.61 KB)
ðŸ“„ class-wp-error.php(7.33 KB)
ðŸ“„ class-wp-fatal-error-handler.php(7.69 KB)
ðŸ“„ class-wp-feed-cache-transient.php(2.53 KB)
ðŸ“„ class-wp-feed-cache.php(996 B)
ðŸ“„ class-wp-hook.php(15.35 KB)
ðŸ“„ class-wp-http-cookie.php(7.24 KB)
ðŸ“„ class-wp-http-curl.php(12.12 KB)
ðŸ“„ class-wp-http-encoding.php(6.53 KB)
ðŸ“„ class-wp-http-ixr-client.php(3.42 KB)
ðŸ“„ class-wp-http-proxy.php(5.84 KB)
ðŸ“„ class-wp-http-requests-hooks.php(1.97 KB)
ðŸ“„ class-wp-http-requests-response.php(4.3 KB)
ðŸ“„ class-wp-http-response.php(2.91 KB)
ðŸ“„ class-wp-http-streams.php(16.31 KB)
ðŸ“„ class-wp-http.php(39.41 KB)
ðŸ“„ class-wp-image-editor-gd.php(16.18 KB)
ðŸ“„ class-wp-image-editor-imagick.php(29.04 KB)
ðŸ“„ class-wp-image-editor.php(16.66 KB)
ðŸ“„ class-wp-list-util.php(7.27 KB)
ðŸ“„ class-wp-locale-switcher.php(6.39 KB)
ðŸ“„ class-wp-locale.php(15.73 KB)
ðŸ“„ class-wp-matchesmapregex.php(1.78 KB)
ðŸ“„ class-wp-meta-query.php(29.8 KB)
ðŸ“„ class-wp-metadata-lazyloader.php(5.25 KB)
ðŸ“„ class-wp-network-query.php(18.83 KB)
ðŸ“„ class-wp-network.php(11.89 KB)
ðŸ“„ class-wp-object-cache.php(17.18 KB)
ðŸ“„ class-wp-oembed-controller.php(6.72 KB)
ðŸ“„ class-wp-oembed.php(30.45 KB)
ðŸ“„ class-wp-paused-extensions-storage.php(4.94 KB)
ðŸ“„ class-wp-post-type.php(25.18 KB)
ðŸ“„ class-wp-post.php(6.33 KB)
ðŸ“„ class-wp-query.php(146.4 KB)
ðŸ“„ class-wp-recovery-mode-cookie-service.php(6.72 KB)
ðŸ“„ class-wp-recovery-mode-email-service.php(10.92 KB)
ðŸ“„ class-wp-recovery-mode-key-service.php(4.4 KB)
ðŸ“„ class-wp-recovery-mode-link-service.php(3.38 KB)
ðŸ“„ class-wp-recovery-mode.php(11.16 KB)
ðŸ“„ class-wp-rewrite.php(61.6 KB)
ðŸ“„ class-wp-role.php(2.46 KB)
ðŸ“„ class-wp-roles.php(8.38 KB)
ðŸ“„ class-wp-scripts.php(18.86 KB)
ðŸ“„ class-wp-session-tokens.php(7.28 KB)
ðŸ“„ class-wp-simplepie-file.php(3.32 KB)
ðŸ“„ class-wp-simplepie-sanitize-kses.php(1.76 KB)
ðŸ“„ class-wp-site-query.php(30.22 KB)
ðŸ“„ class-wp-site.php(7.28 KB)
ðŸ“„ class-wp-styles.php(10.64 KB)
ðŸ“„ class-wp-tax-query.php(19.06 KB)
ðŸ“„ class-wp-taxonomy.php(18.03 KB)
ðŸ“„ class-wp-term-query.php(39.48 KB)
ðŸ“„ class-wp-term.php(5.17 KB)
ðŸ“„ class-wp-text-diff-renderer-inline.php(830 B)
ðŸ“„ class-wp-text-diff-renderer-table.php(16.76 KB)
ðŸ“„ class-wp-textdomain-registry.php(5.83 KB)
ðŸ“„ class-wp-theme-json-data.php(1.52 KB)
ðŸ“„ class-wp-theme-json-resolver.php(23.41 KB)
ðŸ“„ class-wp-theme-json-schema.php(4.22 KB)
ðŸ“„ class-wp-theme-json.php(116.44 KB)
ðŸ“„ class-wp-theme.php(54.16 KB)
ðŸ“„ class-wp-user-meta-session-tokens.php(2.92 KB)
ðŸ“„ class-wp-user-query.php(38.89 KB)
ðŸ“„ class-wp-user-request.php(2.17 KB)
ðŸ“„ class-wp-user.php(22.23 KB)
ðŸ“„ class-wp-walker.php(12.86 KB)
ðŸ“„ class-wp-widget-factory.php(3.27 KB)
ðŸ“„ class-wp-widget.php(17.95 KB)
ðŸ“„ class-wp-xmlrpc-server.php(208.55 KB)
ðŸ“„ class-wp.php(25.39 KB)
ðŸ“„ class-wpdb.php(116.29 KB)
ðŸ“„ class.wp-dependencies.php(373 B)
ðŸ“„ class.wp-scripts.php(343 B)
ðŸ“„ class.wp-styles.php(338 B)
ðŸ“„ comment-template.php(97.57 KB)
ðŸ“„ comment.php(125.63 KB)
ðŸ“„ compat.php(15 KB)
ðŸ“„ cron.php(40.56 KB)
ðŸ“ css
ðŸ“ customize
ðŸ“„ date.php(400 B)
ðŸ“„ default-constants.php(10.29 KB)
ðŸ“„ default-filters.php(30.85 KB)
ðŸ“„ default-widgets.php(2.17 KB)
ðŸ“„ deprecated.php(133.95 KB)
ðŸ“„ embed-template.php(338 B)
ðŸ“„ embed.php(36.58 KB)
ðŸ“„ error-protection.php(4.02 KB)
ðŸ“„ feed-atom-comments.php(5.32 KB)
ðŸ“„ feed-atom.php(2.98 KB)
ðŸ“„ feed-rdf.php(2.61 KB)
ðŸ“„ feed-rss.php(1.16 KB)
ðŸ“„ feed-rss2-comments.php(3.98 KB)
ðŸ“„ feed-rss2.php(3.71 KB)
ðŸ“„ feed.php(22.46 KB)
ðŸ“ fonts
ðŸ“„ formatting.php(325.29 KB)
ðŸ“„ functions.php(255.49 KB)
ðŸ“„ functions.wp-scripts.php(13.2 KB)
ðŸ“„ functions.wp-styles.php(8.38 KB)
ðŸ“„ general-template.php(163.92 KB)
ðŸ“„ global-styles-and-settings.php(13.86 KB)
ðŸ“ html-api
ðŸ“„ http.php(22.62 KB)
ðŸ“„ https-detection.php(6.7 KB)
ðŸ“„ https-migration.php(4.62 KB)
ðŸ“ images
ðŸ“ js
ðŸ“„ kses.php(69.6 KB)
ðŸ“„ l10n.php(60.47 KB)
ðŸ“„ link-template.php(150.32 KB)
ðŸ“„ load.php(50.37 KB)
ðŸ“„ locale.php(162 B)
ðŸ“„ media-template.php(59.9 KB)
ðŸ“„ media.php(188.13 KB)
ðŸ“„ meta.php(61.72 KB)
ðŸ“„ ms-blogs.php(24.93 KB)
ðŸ“„ ms-default-constants.php(4.78 KB)
ðŸ“„ ms-default-filters.php(6.48 KB)
ðŸ“„ ms-deprecated.php(21.25 KB)
ðŸ“„ ms-files.php(2.59 KB)
ðŸ“„ ms-functions.php(89.14 KB)
ðŸ“„ ms-load.php(19.38 KB)
ðŸ“„ ms-network.php(3.71 KB)
ðŸ“„ ms-settings.php(4.03 KB)
ðŸ“„ ms-site.php(39.13 KB)
ðŸ“„ nav-menu-template.php(25.18 KB)
ðŸ“„ nav-menu.php(42.21 KB)
ðŸ“„ option.php(77.86 KB)
ðŸ“ php-compat
ðŸ“„ pluggable-deprecated.php(6.12 KB)
ðŸ“„ pluggable.php(108.27 KB)
ðŸ“„ plugin.php(35.15 KB)
ðŸ“ pomo
ðŸ“„ post-formats.php(6.93 KB)
ðŸ“„ post-template.php(65.28 KB)
ðŸ“„ post-thumbnail-template.php(10.75 KB)
ðŸ“„ post.php(268.82 KB)
ðŸ“„ query.php(36.13 KB)
ðŸ“ random_compat
ðŸ“„ registration-functions.php(200 B)
ðŸ“„ registration.php(200 B)
ðŸ“ rest-api
ðŸ“„ rest-api.php(94.41 KB)
ðŸ“„ revision.php(24.82 KB)
ðŸ“„ rewrite.php(19.04 KB)
ðŸ“„ robots-template.php(5.06 KB)
ðŸ“„ rss-functions.php(255 B)
ðŸ“„ rss.php(22.46 KB)
ðŸ“„ script-loader.php(133.74 KB)
ðŸ“„ session.php(258 B)
ðŸ“„ shortcodes.php(20.93 KB)
ðŸ“ sitemaps
ðŸ“„ sitemaps.php(3.16 KB)
ðŸ“ sodium_compat
ðŸ“„ spl-autoload-compat.php(441 B)
ðŸ“ style-engine
ðŸ“„ style-engine.php(6.25 KB)
ðŸ“„ taxonomy.php(168.15 KB)
ðŸ“„ template-canvas.php(592 B)
ðŸ“„ template-loader.php(2.94 KB)
ðŸ“„ template.php(22.77 KB)
ðŸ“ theme-compat
ðŸ“„ theme-i18n.json(1.12 KB)
ðŸ“„ theme-templates.php(5.38 KB)
ðŸ“„ theme.json(9.81 KB)
ðŸ“„ theme.php(126.88 KB)
ðŸ“„ update.php(33.86 KB)
ðŸ“„ user.php(165.74 KB)
ðŸ“„ vars.php(5.74 KB)
ðŸ“„ version.php(929 B)
ðŸ“ widgets
ðŸ“„ widgets.php(68.22 KB)
ðŸ“„ wlwmanifest.xml(1.02 KB)
ðŸ“„ wp-db.php(445 B)
ðŸ“„ wp-diff.php(647 B)

Editing: post-thumbnail-template.php

<?php
/**
 * WordPress Post Thumbnail Template Functions.
 *
 * Support for post thumbnails.
 * Theme's functions.php must call add_theme_support( 'post-thumbnails' ) to use these.
 *
 * @package WordPress
 * @subpackage Template
 */

/**
 * Determines whether a post has an image attached.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.9.0
 * @since 4.4.0 `$post` can be a post ID or WP_Post object.
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return bool Whether the post has an image attached.
 */
function has_post_thumbnail( $post = null ) {
	$thumbnail_id  = get_post_thumbnail_id( $post );
	$has_thumbnail = (bool) $thumbnail_id;

/**
	 * Filters whether a post has a post thumbnail.
	 *
	 * @since 5.1.0
	 *
	 * @param bool             $has_thumbnail true if the post has a post thumbnail, otherwise false.
	 * @param int|WP_Post|null $post          Post ID or WP_Post object. Default is global `$post`.
	 * @param int|false        $thumbnail_id  Post thumbnail ID or false if the post does not exist.
	 */
	return (bool) apply_filters( 'has_post_thumbnail', $has_thumbnail, $post, $thumbnail_id );
}

/**
 * Retrieves the post thumbnail ID.
 *
 * @since 2.9.0
 * @since 4.4.0 `$post` can be a post ID or WP_Post object.
 * @since 5.5.0 The return value for a non-existing post
 *              was changed to false instead of an empty string.
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return int|false Post thumbnail ID (which can be 0 if the thumbnail is not set),
 *                   or false if the post does not exist.
 */
function get_post_thumbnail_id( $post = null ) {
	$post = get_post( $post );

if ( ! $post ) {
		return false;
	}

$thumbnail_id = (int) get_post_meta( $post->ID, '_thumbnail_id', true );

/**
	 * Filters the post thumbnail ID.
	 *
	 * @since 5.9.0
	 *
	 * @param int|false        $thumbnail_id Post thumbnail ID or false if the post does not exist.
	 * @param int|WP_Post|null $post         Post ID or WP_Post object. Default is global `$post`.
	 */
	return (int) apply_filters( 'post_thumbnail_id', $thumbnail_id, $post );
}

/**
 * Displays the post thumbnail.
 *
 * 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.
 *
 * @since 2.9.0
 *
 * @see get_the_post_thumbnail()
 *
 * @param string|int[] $size 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'.
 * @param string|array $attr Optional. Query string or array of attributes. Default empty.
 */
function the_post_thumbnail( $size = 'post-thumbnail', $attr = '' ) {
	echo get_the_post_thumbnail( null, $size, $attr );
}

/**
 * Updates cache for thumbnails in the current loop.
 *
 * @since 3.2.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param WP_Query $wp_query Optional. A WP_Query instance. Defaults to the $wp_query global.
 */
function update_post_thumbnail_cache( $wp_query = null ) {
	if ( ! $wp_query ) {
		$wp_query = $GLOBALS['wp_query'];
	}

if ( $wp_query->thumbnails_cached ) {
		return;
	}

$thumb_ids = array();

foreach ( $wp_query->posts as $post ) {
		$id = get_post_thumbnail_id( $post->ID );
		if ( $id ) {
			$thumb_ids[] = $id;
		}
	}

if ( ! empty( $thumb_ids ) ) {
		_prime_post_caches( $thumb_ids, false, true );
	}

$wp_query->thumbnails_cached = true;
}

/**
 * Retrieves the post thumbnail.
 *
 * 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.
 *
 * @since 2.9.0
 * @since 4.4.0 `$post` can be a post ID or WP_Post object.
 *
 * @param int|WP_Post  $post Optional. Post ID or WP_Post object.  Default is global `$post`.
 * @param string|int[] $size 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'.
 * @param string|array $attr Optional. Query string or array of attributes. Default empty.
 * @return string The post thumbnail image tag.
 */
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();
		}

// Add `loading` attribute.
		if ( wp_lazy_loading_enabled( 'img', 'the_post_thumbnail' ) ) {
			// 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 );
}

/**
 * Returns the post thumbnail URL.
 *
 * @since 4.4.0
 *
 * @param int|WP_Post  $post Optional. Post ID or WP_Post object.  Default is global `$post`.
 * @param string|int[] $size Optional. Registered image size to retrieve the source for or a flat array
 *                           of height and width dimensions. Default 'post-thumbnail'.
 * @return string|false Post thumbnail URL or false if no image is available. If `$size` does not match
 *                      any registered image size, the original image URL will be returned.
 */
function get_the_post_thumbnail_url( $post = null, $size = 'post-thumbnail' ) {
	$post_thumbnail_id = get_post_thumbnail_id( $post );

if ( ! $post_thumbnail_id ) {
		return false;
	}

$thumbnail_url = wp_get_attachment_image_url( $post_thumbnail_id, $size );

/**
	 * Filters the post thumbnail URL.
	 *
	 * @since 5.9.0
	 *
	 * @param string|false     $thumbnail_url Post thumbnail URL or false if the post does not exist.
	 * @param int|WP_Post|null $post          Post ID or WP_Post object. Default is global `$post`.
	 * @param string|int[]     $size          Registered image size to retrieve the source for or a flat array
	 *                                        of height and width dimensions. Default 'post-thumbnail'.
	 */
	return apply_filters( 'post_thumbnail_url', $thumbnail_url, $post, $size );
}

/**
 * Displays the post thumbnail URL.
 *
 * @since 4.4.0
 *
 * @param string|int[] $size Optional. Image size to use. Accepts any valid image size,
 *                           or an array of width and height values in pixels (in that order).
 *                           Default 'post-thumbnail'.
 */
function the_post_thumbnail_url( $size = 'post-thumbnail' ) {
	$url = get_the_post_thumbnail_url( null, $size );

if ( $url ) {
		echo esc_url( $url );
	}
}

/**
 * Returns the post thumbnail caption.
 *
 * @since 4.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return string Post thumbnail caption.
 */
function get_the_post_thumbnail_caption( $post = null ) {
	$post_thumbnail_id = get_post_thumbnail_id( $post );

if ( ! $post_thumbnail_id ) {
		return '';
	}

$caption = wp_get_attachment_caption( $post_thumbnail_id );

if ( ! $caption ) {
		$caption = '';
	}

return $caption;
}

/**
 * Displays the post thumbnail caption.
 *
 * @since 4.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 */
function the_post_thumbnail_caption( $post = null ) {
	/**
	 * Filters the displayed post thumbnail caption.
	 *
	 * @since 4.6.0
	 *
	 * @param string $caption Caption for the given attachment.
	 */
	echo apply_filters( 'the_post_thumbnail_caption', get_the_post_thumbnail_caption( $post ) );
}

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