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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 |
|---|---|
| 999 | * @param string $subject Subject of the notification email. |
| 1000 | * @param string $domain Site domain. |
| 1001 | * @param string $path Site path. |
| 1002 | * @param string $title Site title. |
| 1003 | * @param string $user_login User login name. |
| 1004 | * @param string $user_email User email address. |
| 1005 | * @param string $key Activation key created in wpmu_signup_blog(). |
| 1006 | * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id. |
| 1007 | */ |
| 1008 | apply_filters( |
| 1009 | 'wpmu_signup_blog_notification_subject', |
| 1010 | /* translators: New site notification email subject. 1: Network title, 2: New site URL. */ |
| 1011 | _x( '[%1$s] Activate %2$s', 'New site notification email subject' ), |
| 1012 | $domain, |
| 1013 | $path, |
| 1014 | $title, |
| 1015 | $user_login, |
| 1016 | $user_email, |
| 1017 | $key, |