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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 174 | * Provides "just in time" filtering of all filters in wp_get_attachment_image(). |
| 175 | * |
| 176 | * @since 2.9.0 |
| 177 | * |
| 178 | * @param int $post_id The post ID. |
| 179 | * @param int $post_thumbnail_id The post thumbnail ID. |
| 180 | * @param string|int[] $size Requested image size. Can be any registered image size name, or |
| 181 | * an array of width and height values in pixels (in that order). |
| 182 | */ |
| 183 | do_action( 'begin_fetch_post_thumbnail_html', $post->ID, $post_thumbnail_id, $size ); |
| 184 | |
| 185 | if ( in_the_loop() ) { |
| 186 | update_post_thumbnail_cache(); |
| 187 | } |
| 188 | |
| 189 | // Get the 'loading' attribute value to use as default, taking precedence over the default from |
| 190 | // `wp_get_attachment_image()`. |
| 191 | $loading = wp_get_loading_attr_default( 'the_post_thumbnail' ); |
| 192 | |