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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 |
|---|---|
| 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 | |
| 1232 | /** |
| 1233 | * Display relational link for the first post. |
| 1234 | * |
| 1235 | * @since 2.8.0 |
| 1236 | * |
| 1237 | * @param string $title Optional. Link title format. |
| 1238 | * @param bool $in_same_cat Optional. Whether link should be in same category. |