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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 |
|---|---|
| 867 | * @param string $subject Subject of the notification email. |
| 868 | * @param string $domain Site domain. |
| 869 | * @param string $path Site path. |
| 870 | * @param string $title Site title. |
| 871 | * @param string $user User login name. |
| 872 | * @param string $user_email User email address. |
| 873 | * @param string $key Activation key created in wpmu_signup_blog(). |
| 874 | * @param array $meta By default, contains the requested privacy setting and lang_id. |
| 875 | */ |
| 876 | apply_filters( 'wpmu_signup_blog_notification_subject', |
| 877 | __( '[%1$s] Activate %2$s' ), |
| 878 | $domain, $path, $title, $user, $user_email, $key, $meta |
| 879 | ), |
| 880 | $from_name, |
| 881 | esc_url( 'http://' . $domain . $path ) |
| 882 | ); |
| 883 | wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
| 884 | return true; |
| 885 | } |