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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 |
|---|---|
| 4878 | |
| 4879 | /** |
| 4880 | * Filter the attachment thumbnail URL. |
| 4881 | * |
| 4882 | * @since 2.1.0 |
| 4883 | * |
| 4884 | * @param string $url URL for the attachment thumbnail. |
| 4885 | * @param int $post_id Attachment ID. |
| 4886 | */ |
| 4887 | return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID ); |
| 4888 | } |
| 4889 | |
| 4890 | /** |
| 4891 | * Check if the attachment is an image. |
| 4892 | * |
| 4893 | * @since 2.1.0 |
| 4894 | * |
| 4895 | * @param int $post_id Attachment ID |
| 4896 | * @return bool |