get_the_post_thumbnail简介
当一个主题添加了‘post-thumbnail’支持时，将注册一个特殊的‘post-thumbnail’图像大小，这与通过the Settings > Media screen.管理的“ ‘thumbnail’ ”图像大小不同。当使用the_post_thumbnail() 或相关函数时，默认情况下会使用‘post-thumbnail’的图像大小，尽管可以根据需要指定不同的大小。
get_the_post_thumbnail参数
$post(int|WP_Post) (Optional)Post ID或者WP_Post对象.缺省值是全局变量 $post.缺省值是null。
$size
(string|int[]) (Optional) 图像大小。接受任何注册的图像大小名称，或以像素为单位的宽度和高度值数组（按此顺序）。默认值：'post-thumbnail'。
$attr
(string|array) (Optional) 字符串或属性数组，缺省为""。
get_the_post_thumbnail返回值
发布后的缩略图图像标签get_the_post_thumbnail函数扩展
如果所需的add_theme_support( 'post-thumbnails' )；在当前主题的函数中。php文件被附加到一个钩子上，则必须在触发init钩子之前调用它。对于某些特性来说，初始挂钩可能已经太晚了。如果它附加到一个钩子上，那么它必须是after_setup_theme.。get_the_post_thumbnail源代码
File: wp-includes/post-thumbnail-template.phpfunction 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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