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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 |
|---|---|
| 79 | * @since 2.9.0 |
| 80 | * |
| 81 | * @param int $post_id Optional. Post ID. |
| 82 | * @param string $size Optional. Image size. Defaults to 'post-thumbnail'. |
| 83 | * @param string|array $attr Optional. Query string or array of attributes. |
| 84 | */ |
| 85 | function get_the_post_thumbnail( $post_id = null, $size = 'post-thumbnail', $attr = '' ) { |
| 86 | $post_id = ( null === $post_id ) ? get_the_ID() : $post_id; |
| 87 | $post_thumbnail_id = get_post_thumbnail_id( $post_id ); |
| 88 | $size = apply_filters( 'post_thumbnail_size', $size ); |
| 89 | if ( $post_thumbnail_id ) { |
| 90 | 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 |
| 91 | if ( in_the_loop() ) |
| 92 | update_post_thumbnail_cache(); |
| 93 | $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr ); |
| 94 | do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); |
| 95 | } else { |
| 96 | $html = ''; |
| 97 | } |