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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 |
|---|---|
| 6616 | |
| 6617 | /** |
| 6618 | * Filters the attachment caption. |
| 6619 | * |
| 6620 | * @since 4.6.0 |
| 6621 | * |
| 6622 | * @param string $caption Caption for the given attachment. |
| 6623 | * @param int $post_id Attachment ID. |
| 6624 | */ |
| 6625 | return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID ); |
| 6626 | } |
| 6627 | |
| 6628 | /** |
| 6629 | * Retrieves URL for an attachment thumbnail. |
| 6630 | * |
| 6631 | * @since 2.1.0 |
| 6632 | * @since 6.1.0 Changed to use wp_get_attachment_image_url(). |
| 6633 | * |
| 6634 | * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`. |