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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 |
---|---|
1004 | * @param string $subject Subject of the notification email. |
1005 | * @param string $domain Site domain. |
1006 | * @param string $path Site path. |
1007 | * @param string $title Site title. |
1008 | * @param string $user_login User login name. |
1009 | * @param string $user_email User email address. |
1010 | * @param string $key Activation key created in wpmu_signup_blog(). |
1011 | * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id. |
1012 | */ |
1013 | apply_filters( |
1014 | 'wpmu_signup_blog_notification_subject', |
1015 | /* translators: New site notification email subject. 1: Network title, 2: New site URL. */ |
1016 | _x( '[%1$s] Activate %2$s', 'New site notification email subject' ), |
1017 | $domain, |
1018 | $path, |
1019 | $title, |
1020 | $user_login, |
1021 | $user_email, |
1022 | $key, |