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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 4 times in this file.
| Line | Code |
|---|---|
| 142 | $in_same_cat = true; |
| 143 | |
| 144 | $post = get_previous_post($in_same_cat, $excluded_categories); |
| 145 | |
| 146 | if ( !$post ) |
| 147 | return; |
| 148 | |
| 149 | $string = '<a href="'.get_permalink($post->ID).'">'.$previous; |
| 150 | if ( 'yes' == $title ) |
| 151 | $string .= apply_filters('the_title', $post->post_title, $post->ID); |
| 152 | $string .= '</a>'; |
| 153 | $format = str_replace('%', $string, $format); |
| 154 | echo $format; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Prints link to the next post. |
| 159 | * |
| 160 | * @since 0.71 |
| Line | Code |
| 177 | $in_same_cat = true; |
| 178 | |
| 179 | $post = get_next_post($in_same_cat, $excluded_categories); |
| 180 | |
| 181 | if ( !$post ) |
| 182 | return; |
| 183 | |
| 184 | $string = '<a href="'.get_permalink($post->ID).'">'.$next; |
| 185 | if ( 'yes' == $title ) |
| 186 | $string .= apply_filters('the_title', $post->post_title, $post->ID); |
| 187 | $string .= '</a>'; |
| 188 | $format = str_replace('%', $string, $format); |
| 189 | echo $format; |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | * Whether user can create a post. |
| 194 | * |
| 195 | * @since 1.5.0 |
| Line | Code |
| 2678 | $post = $posts[0]; |
| 2679 | |
| 2680 | if ( empty($post->post_title) ) |
| 2681 | $post->post_title = $start ? __('First Post') : __('Last Post'); |
| 2682 | |
| 2683 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 2684 | |
| 2685 | $title = str_replace('%title', $post->post_title, $title); |
| 2686 | $title = str_replace('%date', $date, $title); |
| 2687 | $title = apply_filters('the_title', $title, $post->ID); |
| 2688 | |
| 2689 | $link = $start ? "<link rel='start' title='" : "<link rel='end' title='"; |
| 2690 | $link .= esc_attr($title); |
| 2691 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 2692 | |
| 2693 | $boundary = $start ? 'start' : 'end'; |
| 2694 | return apply_filters( "{$boundary}_post_rel_link", $link ); |
| 2695 | } |
| 2696 | |
| Line | Code |
| 2753 | $post = get_post($GLOBALS['post']->post_parent); |
| 2754 | |
| 2755 | if ( empty($post) ) |
| 2756 | return; |
| 2757 | |
| 2758 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 2759 | |
| 2760 | $title = str_replace('%title', $post->post_title, $title); |
| 2761 | $title = str_replace('%date', $date, $title); |
| 2762 | $title = apply_filters('the_title', $title, $post->ID); |
| 2763 | |
| 2764 | $link = "<link rel='up' title='"; |
| 2765 | $link .= esc_attr( $title ); |
| 2766 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 2767 | |
| 2768 | return apply_filters( "parent_post_rel_link", $link ); |
| 2769 | } |
| 2770 | |
| 2771 | /** |