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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 389 | |
| 390 | if ( is_attachment() ) |
| 391 | $post = & get_post($GLOBALS['post']->post_parent); |
| 392 | else |
| 393 | $post = get_previous_post($in_same_cat, $excluded_categories); |
| 394 | |
| 395 | if ( !$post ) |
| 396 | return; |
| 397 | |
| 398 | $title = apply_filters('the_title', $post->post_title, $post); |
| 399 | $string = '<a href="'.get_permalink($post->ID).'">'; |
| 400 | $link = str_replace('%title', $title, $link); |
| 401 | $link = $pre . $string . $link . '</a>'; |
| 402 | |
| 403 | $format = str_replace('%link', $link, $format); |
| 404 | |
| 405 | echo $format; |
| 406 | } |
| 407 | |
| 408 | function next_post_link($format='%link »', $link='%title', $in_same_cat = false, $excluded_categories = '') { |
| 409 | $post = get_next_post($in_same_cat, $excluded_categories); |
| 410 | |
| 411 | if ( !$post ) |
| 412 | return; |
| 413 | |
| 414 | $title = apply_filters('the_title', $post->post_title, $post); |
| 415 | $string = '<a href="'.get_permalink($post->ID).'">'; |
| 416 | $link = str_replace('%title', $title, $link); |
| 417 | $link = $string . $link . '</a>'; |
| 418 | $format = str_replace('%link', $link, $format); |
| 419 | |
| 420 | echo $format; |
| 421 | } |
| 422 | |
| 423 | function get_pagenum_link($pagenum = 1) { |