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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 |
|---|---|
| 3158 | * @since 2.9.0 |
| 3159 | * |
| 3160 | * @param string $concat_useragent The user agent concatenated with ' -- WordPress/' |
| 3161 | * and the WordPress version. |
| 3162 | * @param string $useragent The useragent. |
| 3163 | * @param string $pingback_server_url The server URL being linked to. |
| 3164 | * @param string $pagelinkedto URL of page linked to. |
| 3165 | * @param string $pagelinkedfrom URL of page linked from. |
| 3166 | */ |
| 3167 | $client->useragent = apply_filters( 'pingback_useragent', $client->useragent . ' -- WordPress/' . get_bloginfo( 'version' ), $client->useragent, $pingback_server_url, $pagelinkedto, $pagelinkedfrom ); |
| 3168 | // When set to true, this outputs debug messages by itself. |
| 3169 | $client->debug = false; |
| 3170 | |
| 3171 | if ( $client->query( 'pingback.ping', $pagelinkedfrom, $pagelinkedto ) || ( isset( $client->error->code ) && 48 == $client->error->code ) ) { // Already registered. |
| 3172 | add_ping( $post, $pagelinkedto ); |
| 3173 | } |
| 3174 | } |
| 3175 | } |
| 3176 | } |