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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 |
|---|---|
| 6701 | |
| 6702 | /** |
| 6703 | * Filters the attachment caption. |
| 6704 | * |
| 6705 | * @since 4.6.0 |
| 6706 | * |
| 6707 | * @param string $caption Caption for the given attachment. |
| 6708 | * @param int $post_id Attachment ID. |
| 6709 | */ |
| 6710 | return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID ); |
| 6711 | } |
| 6712 | |
| 6713 | /** |
| 6714 | * Retrieve thumbnail for an attachment. |
| 6715 | * |
| 6716 | * @since 2.1.0 |
| 6717 | * |
| 6718 | * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`. |
| 6719 | * @return string|false Thumbnail file path on success, false on failure. |