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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 |
|---|---|
| 1075 | return; |
| 1076 | |
| 1077 | if ( empty($post->post_title) ) |
| 1078 | $post->post_title = $previous ? __('Previous Post') : __('Next Post'); |
| 1079 | |
| 1080 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 1081 | |
| 1082 | $title = str_replace('%title', $post->post_title, $title); |
| 1083 | $title = str_replace('%date', $date, $title); |
| 1084 | $title = apply_filters('the_title', $title, $post->ID); |
| 1085 | |
| 1086 | $link = $previous ? "<link rel='prev' title='" : "<link rel='next' title='"; |
| 1087 | $link .= esc_attr( $title ); |
| 1088 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 1089 | |
| 1090 | $adjacent = $previous ? 'previous' : 'next'; |
| 1091 | return apply_filters( "{$adjacent}_post_rel_link", $link ); |
| 1092 | } |
| 1093 | |
| Line | Code |
| 1213 | $post = $posts[0]; |
| 1214 | |
| 1215 | if ( empty($post->post_title) ) |
| 1216 | $post->post_title = $start ? __('First Post') : __('Last Post'); |
| 1217 | |
| 1218 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 1219 | |
| 1220 | $title = str_replace('%title', $post->post_title, $title); |
| 1221 | $title = str_replace('%date', $date, $title); |
| 1222 | $title = apply_filters('the_title', $title, $post->ID); |
| 1223 | |
| 1224 | $link = $start ? "<link rel='start' title='" : "<link rel='end' title='"; |
| 1225 | $link .= esc_attr($title); |
| 1226 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 1227 | |
| 1228 | $boundary = $start ? 'start' : 'end'; |
| 1229 | return apply_filters( "{$boundary}_post_rel_link", $link ); |
| 1230 | } |
| 1231 | |
| Line | Code |
| 1276 | $post = & get_post($GLOBALS['post']->post_parent); |
| 1277 | |
| 1278 | if ( empty($post) ) |
| 1279 | return; |
| 1280 | |
| 1281 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 1282 | |
| 1283 | $title = str_replace('%title', $post->post_title, $title); |
| 1284 | $title = str_replace('%date', $date, $title); |
| 1285 | $title = apply_filters('the_title', $title, $post->ID); |
| 1286 | |
| 1287 | $link = "<link rel='up' title='"; |
| 1288 | $link .= esc_attr( $title ); |
| 1289 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 1290 | |
| 1291 | return apply_filters( "parent_post_rel_link", $link ); |
| 1292 | } |
| 1293 | |
| 1294 | /** |
| Line | Code |
| 1349 | |
| 1350 | if ( !$post ) |
| 1351 | return; |
| 1352 | |
| 1353 | $title = $post->post_title; |
| 1354 | |
| 1355 | if ( empty($post->post_title) ) |
| 1356 | $title = $previous ? __('Previous Post') : __('Next Post'); |
| 1357 | |
| 1358 | $title = apply_filters('the_title', $title, $post->ID); |
| 1359 | $date = mysql2date(get_option('date_format'), $post->post_date); |
| 1360 | $rel = $previous ? 'prev' : 'next'; |
| 1361 | |
| 1362 | $string = '<a href="'.get_permalink($post).'" rel="'.$rel.'">'; |
| 1363 | $link = str_replace('%title', $title, $link); |
| 1364 | $link = str_replace('%date', $date, $link); |
| 1365 | $link = $string . $link . '</a>'; |
| 1366 | |
| 1367 | $format = str_replace('%link', $link, $format); |