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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 |
|---|---|
| 87 | $post_thumbnail_id = get_post_thumbnail_id( $post_id ); |
| 88 | |
| 89 | /** |
| 90 | * Filter the post thumbnail size. |
| 91 | * |
| 92 | * @since 2.9.0 |
| 93 | * |
| 94 | * @param string $size The post thumbnail size. |
| 95 | */ |
| 96 | $size = apply_filters( 'post_thumbnail_size', $size ); |
| 97 | |
| 98 | if ( $post_thumbnail_id ) { |
| 99 | |
| 100 | /** |
| 101 | * Fires before fetching the post thumbnail HTML. |
| 102 | * |
| 103 | * Provides "just in time" filtering of all filters in wp_get_attachment_image(). |
| 104 | * |
| 105 | * @since 2.9.0 |