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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 |
|---|---|
| 2426 | * @since 2.9.0 |
| 2427 | * |
| 2428 | * @param string $concat_useragent The user agent concatenated with ' -- WordPress/' |
| 2429 | * and the WordPress version. |
| 2430 | * @param string $useragent The useragent. |
| 2431 | * @param string $pingback_server_url The server URL being linked to. |
| 2432 | * @param string $pagelinkedto URL of page linked to. |
| 2433 | * @param string $pagelinkedfrom URL of page linked from. |
| 2434 | */ |
| 2435 | $client->useragent = apply_filters( 'pingback_useragent', $client->useragent . ' -- WordPress/' . $wp_version, $client->useragent, $pingback_server_url, $pagelinkedto, $pagelinkedfrom ); |
| 2436 | // when set to true, this outputs debug messages by itself |
| 2437 | $client->debug = false; |
| 2438 | |
| 2439 | if ( $client->query('pingback.ping', $pagelinkedfrom, $pagelinkedto) || ( isset($client->error->code) && 48 == $client->error->code ) ) // Already registered |
| 2440 | add_ping( $post_ID, $pagelinkedto ); |
| 2441 | } |
| 2442 | } |
| 2443 | } |
| 2444 | |