angelovcom.net

post-thumbnail-template.php (9353B)

---

 <?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 );
 }
 
 /**
  * Retrieve 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;
 	}
 
 	return (int) get_post_meta( $post->ID, '_thumbnail_id', true );
 }
 
 /**
  * Display 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 );
 }
 
 /**
  * Update 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;
 }
 
 /**
  * Retrieve 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();
 		}
 
 		$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.
 	 * @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       $attr              Query string of attributes.
 	 */
 	return apply_filters( 'post_thumbnail_html', $html, $post->ID, $post_thumbnail_id, $size, $attr );
 }
 
 /**
  * Return 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;
 	}
 
 	return wp_get_attachment_image_url( $post_thumbnail_id, $size );
 }
 
 /**
  * Display 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 ) );
 }