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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 |
|---|---|
| 586 | |
| 587 | if ( !$post ) |
| 588 | return; |
| 589 | |
| 590 | $title = $post->post_title; |
| 591 | |
| 592 | if ( empty($post->post_title) ) |
| 593 | $title = $previous ? __('Previous Post') : __('Next Post'); |
| 594 | |
| 595 | $title = apply_filters('the_title', $title, $post); |
| 596 | $string = '<a href="'.get_permalink($post).'">'; |
| 597 | $link = str_replace('%title', $title, $link); |
| 598 | $link = $string . $link . '</a>'; |
| 599 | |
| 600 | $format = str_replace('%link', $link, $format); |
| 601 | |
| 602 | echo $format; |
| 603 | } |
| 604 | |