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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 |
|---|---|
| 949 | |
| 950 | if ( !$post ) |
| 951 | return; |
| 952 | |
| 953 | $title = $post->post_title; |
| 954 | |
| 955 | if ( empty($post->post_title) ) |
| 956 | $title = $previous ? __('Previous Post') : __('Next Post'); |
| 957 | |
| 958 | $title = apply_filters('the_title', $title, $post); |
| 959 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 960 | |
| 961 | $string = '<a href="'.get_permalink($post).'">'; |
| 962 | $link = str_replace('%title', $title, $link); |
| 963 | $link = str_replace('%date', $date, $link); |
| 964 | $link = $string . $link . '</a>'; |
| 965 | |
| 966 | $format = str_replace('%link', $link, $format); |
| 967 | |