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<?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\|null $post Optional. Post ID or WP_Post object. Default is global `$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\|null $post Optional. Post ID or WP_Post object. Default is global `$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\|null $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(); / * $wp_query may contain an array of post objects or post IDs. * * This ensures the cache is primed for all post objects to avoid * `get_post()` calls in `get_the_post_thumbnail()` triggering an * additional database call for each post. / $parent_post_ids = array(); foreach ( $wp_query->posts as $post ) { if ( $post instanceof WP_Post ) { $parent_post_ids[] = $post->ID; } elseif ( is_int( $post ) ) { $parent_post_ids[] = $post; } } _prime_post_caches( $parent_post_ids, false, true ); foreach ( $wp_query->posts as $post ) { $id = get_post_thumbnail_id( $post ); 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\|null $post Optional. Post ID or WP_Post object. Default is global `$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, 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\|null $post Optional. Post ID or WP_Post object. Default is global `$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\|null $post Optional. Post ID or WP_Post object. Default is global `$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\|null $post Optional. Post ID or WP_Post object. Default is global `$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 ) ); }