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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 |
|---|---|
| 183 | $id = (int) $id; |
| 184 | if ( !$id ) |
| 185 | $id = (int) $post->ID; |
| 186 | |
| 187 | if ( 'page' == get_option('show_on_front') && $id == get_option('page_on_front') ) |
| 188 | $link = get_option('home'); |
| 189 | else |
| 190 | $link = _get_page_link( $id , $leavename ); |
| 191 | |
| 192 | return apply_filters('page_link', $link, $id); |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * Retrieve the page permalink. |
| 197 | * |
| 198 | * Ignores page_on_front. Internal use only. |
| 199 | * |
| 200 | * @since 2.1.0 |
| 201 | * @access private |