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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 |
|---|---|
| 639 | * Filters the current feed URL. |
| 640 | * |
| 641 | * @since 3.6.0 |
| 642 | * |
| 643 | * @see set_url_scheme() |
| 644 | * @see wp_unslash() |
| 645 | * |
| 646 | * @param string $feed_link The link for the feed with set URL scheme. |
| 647 | */ |
| 648 | echo esc_url( apply_filters( 'self_link', get_self_link() ) ); |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * Get the timestamp of the most recently modified post from WP_Query. |
| 653 | * |
| 654 | * If viewing a comment feed, the timestamp of the most recently modified |
| 655 | * comment will be returned. |
| 656 | * |
| 657 | * @global WP_Query $wp_query WordPress Query object. |