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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 |
|---|---|
| 6241 | |
| 6242 | /** |
| 6243 | * Filters the attachment caption. |
| 6244 | * |
| 6245 | * @since 4.6.0 |
| 6246 | * |
| 6247 | * @param string $caption Caption for the given attachment. |
| 6248 | * @param int $post_id Attachment ID. |
| 6249 | */ |
| 6250 | return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID ); |
| 6251 | } |
| 6252 | |
| 6253 | /** |
| 6254 | * Retrieve thumbnail for an attachment. |
| 6255 | * |
| 6256 | * @since 2.1.0 |
| 6257 | * |
| 6258 | * @param int $post_id Optional. Attachment ID. Default 0. |
| 6259 | * @return string|false False on failure. Thumbnail file path on success. |