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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 |
|---|---|
| 95 | |
| 96 | if ( !$id ) |
| 97 | $id = $post->ID; |
| 98 | |
| 99 | if ( 'page' == get_option('show_on_front') && $id == get_option('page_on_front') ) |
| 100 | $link = get_option('home'); |
| 101 | else |
| 102 | $link = _get_page_link( $id ); |
| 103 | |
| 104 | return apply_filters('page_link', $link, $id); |
| 105 | } |
| 106 | |
| 107 | // Ignores page_on_front. Internal use only. |
| 108 | function _get_page_link( $id = false ) { |
| 109 | global $post, $wp_rewrite; |
| 110 | |
| 111 | if ( !$id ) |
| 112 | $id = $post->ID; |
| 113 | |