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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 |
---|---|
6650 |
|
6651 | /** |
6652 | * Filters the attachment URL. |
6653 | * |
6654 | * @since 2.1.0 |
6655 | * |
6656 | * @param string $url URL for the given attachment. |
6657 | * @param int $attachment_id Attachment post ID. |
6658 | */ |
6659 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
6660 |
|
6661 | if ( ! $url ) { |
6662 | return false; |
6663 | } |
6664 |
|
6665 | return $url; |
6666 | } |
6667 |
|
6668 | /** |