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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 |
|---|---|
| 4982 | |
| 4983 | /** |
| 4984 | * Filters the attachment caption. |
| 4985 | * |
| 4986 | * @since 4.6.0 |
| 4987 | * |
| 4988 | * @param string $caption Caption for the given attachment. |
| 4989 | * @param int $post_id Attachment ID. |
| 4990 | */ |
| 4991 | return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID ); |
| 4992 | } |
| 4993 | |
| 4994 | /** |
| 4995 | * Retrieve thumbnail for an attachment. |
| 4996 | * |
| 4997 | * @since 2.1.0 |
| 4998 | * |
| 4999 | * @param int $post_id Optional. Attachment ID. Default 0. |
| 5000 | * @return string|false False on failure. Thumbnail file path on success. |