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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 |
|---|---|
| 996 | return; |
| 997 | |
| 998 | if ( empty($post->post_title) ) |
| 999 | $post->post_title = $previous ? __('Previous Post') : __('Next Post'); |
| 1000 | |
| 1001 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 1002 | |
| 1003 | $title = str_replace('%title', $post->post_title, $title); |
| 1004 | $title = str_replace('%date', $date, $title); |
| 1005 | $title = apply_filters('the_title', $title, $post); |
| 1006 | |
| 1007 | $link = $previous ? "<link rel='prev' title='" : "<link rel='next' title='"; |
| 1008 | $link .= esc_attr( $title ); |
| 1009 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 1010 | |
| 1011 | $adjacent = $previous ? 'previous' : 'next'; |
| 1012 | return apply_filters( "{$adjacent}_post_rel_link", $link ); |
| 1013 | } |
| 1014 | |
| Line | Code |
| 1120 | return; |
| 1121 | |
| 1122 | if ( empty($post->post_title) ) |
| 1123 | $post->post_title = $start ? __('First Post') : __('Last Post'); |
| 1124 | |
| 1125 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 1126 | |
| 1127 | $title = str_replace('%title', $post->post_title, $title); |
| 1128 | $title = str_replace('%date', $date, $title); |
| 1129 | $title = apply_filters('the_title', $title, $post); |
| 1130 | |
| 1131 | $link = $start ? "<link rel='start' title='" : "<link rel='end' title='"; |
| 1132 | $link .= esc_attr($title); |
| 1133 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 1134 | |
| 1135 | $boundary = $start ? 'start' : 'end'; |
| 1136 | return apply_filters( "{$boundary}_post_rel_link", $link ); |
| 1137 | } |
| 1138 | |
| Line | Code |
| 1183 | $post = & get_post($GLOBALS['post']->post_parent); |
| 1184 | |
| 1185 | if ( empty($post) ) |
| 1186 | return; |
| 1187 | |
| 1188 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 1189 | |
| 1190 | $title = str_replace('%title', $post->post_title, $title); |
| 1191 | $title = str_replace('%date', $date, $title); |
| 1192 | $title = apply_filters('the_title', $title, $post); |
| 1193 | |
| 1194 | $link = "<link rel='up' title='"; |
| 1195 | $link .= esc_attr( $title ); |
| 1196 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 1197 | |
| 1198 | return apply_filters( "parent_post_rel_link", $link ); |
| 1199 | } |
| 1200 | |
| 1201 | /** |
| Line | Code |
| 1256 | |
| 1257 | if ( !$post ) |
| 1258 | return; |
| 1259 | |
| 1260 | $title = $post->post_title; |
| 1261 | |
| 1262 | if ( empty($post->post_title) ) |
| 1263 | $title = $previous ? __('Previous Post') : __('Next Post'); |
| 1264 | |
| 1265 | $title = apply_filters('the_title', $title, $post); |
| 1266 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 1267 | $rel = $previous ? 'prev' : 'next'; |
| 1268 | |
| 1269 | $string = '<a href="'.get_permalink($post).'" rel="'.$rel.'">'; |
| 1270 | $link = str_replace('%title', $title, $link); |
| 1271 | $link = str_replace('%date', $date, $link); |
| 1272 | $link = $string . $link . '</a>'; |
| 1273 | |
| 1274 | $format = str_replace('%link', $link, $format); |