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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 |
---|---|
6718 |
|
6719 | /** |
6720 | * Filters the attachment caption. |
6721 | * |
6722 | * @since 4.6.0 |
6723 | * |
6724 | * @param string $caption Caption for the given attachment. |
6725 | * @param int $post_id Attachment ID. |
6726 | */ |
6727 | return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID ); |
6728 | } |
6729 |
|
6730 | /** |
6731 | * Retrieves URL for an attachment thumbnail. |
6732 | * |
6733 | * @since 2.1.0 |
6734 | * @since 6.1.0 Changed to use wp_get_attachment_image_url(). |
6735 | * |
6736 | * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`. |