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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 |
---|---|
6662 |
|
6663 | /** |
6664 | * Filters the attachment URL. |
6665 | * |
6666 | * @since 2.1.0 |
6667 | * |
6668 | * @param string $url URL for the given attachment. |
6669 | * @param int $attachment_id Attachment post ID. |
6670 | */ |
6671 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
6672 |
|
6673 | if ( ! $url ) { |
6674 | return false; |
6675 | } |
6676 |
|
6677 | return $url; |
6678 | } |
6679 |
|
6680 | /** |