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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 |
|---|---|
| 6593 | |
| 6594 | /** |
| 6595 | * Filters the attachment caption. |
| 6596 | * |
| 6597 | * @since 4.6.0 |
| 6598 | * |
| 6599 | * @param string $caption Caption for the given attachment. |
| 6600 | * @param int $post_id Attachment ID. |
| 6601 | */ |
| 6602 | return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID ); |
| 6603 | } |
| 6604 | |
| 6605 | /** |
| 6606 | * Retrieves URL for an attachment thumbnail. |
| 6607 | * |
| 6608 | * @since 2.1.0 |
| 6609 | * @since 6.1.0 Changed to use wp_get_attachment_image_url(). |
| 6610 | * |
| 6611 | * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`. |