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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 |
---|---|
968 | * @param string $subject Subject of the notification email. |
969 | * @param string $domain Site domain. |
970 | * @param string $path Site path. |
971 | * @param string $title Site title. |
972 | * @param string $user_login User login name. |
973 | * @param string $user_email User email address. |
974 | * @param string $key Activation key created in wpmu_signup_blog(). |
975 | * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id. |
976 | */ |
977 | apply_filters( |
978 | 'wpmu_signup_blog_notification_subject', |
979 | /* translators: New site notification email subject. 1: Network title, 2: New site URL. */ |
980 | _x( '[%1$s] Activate %2$s', 'New site notification email subject' ), |
981 | $domain, |
982 | $path, |
983 | $title, |
984 | $user_login, |
985 | $user_email, |
986 | $key, |