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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 |
|---|---|
| 598 | |
| 599 | if ( !$post ) |
| 600 | return; |
| 601 | |
| 602 | $title = $post->post_title; |
| 603 | |
| 604 | if ( empty($post->post_title) ) |
| 605 | $title = $previous ? __('Previous Post') : __('Next Post'); |
| 606 | |
| 607 | $title = apply_filters('the_title', $title, $post); |
| 608 | $string = '<a href="'.get_permalink($post).'">'; |
| 609 | $link = str_replace('%title', $title, $link); |
| 610 | $link = $string . $link . '</a>'; |
| 611 | |
| 612 | $format = str_replace('%link', $link, $format); |
| 613 | |
| 614 | $adjacent = $previous ? 'previous' : 'next'; |
| 615 | echo apply_filters( "{$adjacent}_post_link", $format, $link ); |
| 616 | } |