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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 |
|---|---|
| 61 | $post_thumbnail_id = get_post_thumbnail_id( $post_id ); |
| 62 | $size = apply_filters( 'post_thumbnail_size', $size ); |
| 63 | if ( $post_thumbnail_id ) { |
| 64 | do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); // for "Just In Time" filtering of all of wp_get_attachment_image()'s filters |
| 65 | $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr ); |
| 66 | do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); |
| 67 | } else { |
| 68 | $html = ''; |
| 69 | } |
| 70 | return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr ); |
| 71 | } |
| 72 | |
| 73 | ?> |
| 74 | |