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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 |
|---|---|
| 6872 | return $this->pingback_error( 48, __( 'The pingback has already been registered.' ) ); |
| 6873 | } |
| 6874 | |
| 6875 | // Very stupid, but gives time to the 'from' server to publish! |
| 6876 | sleep( 1 ); |
| 6877 | |
| 6878 | $remote_ip = preg_replace( '/[^0-9a-fA-F:., ]/', '', $_SERVER['REMOTE_ADDR'] ); |
| 6879 | |
| 6880 | /** This filter is documented in wp-includes/class-http.php */ |
| 6881 | $user_agent = apply_filters( 'http_headers_useragent', 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ), $pagelinkedfrom ); |
| 6882 | |
| 6883 | // Let's check the remote site. |
| 6884 | $http_api_args = array( |
| 6885 | 'timeout' => 10, |
| 6886 | 'redirection' => 0, |
| 6887 | 'limit_response_size' => 153600, // 150 KB |
| 6888 | 'user-agent' => "$user_agent; verifying pingback from $remote_ip", |
| 6889 | 'headers' => array( |
| 6890 | 'X-Pingback-Forwarded-For' => $remote_ip, |