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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 |
|---|---|
| 906 | * @param string $subject Subject of the notification email. |
| 907 | * @param string $domain Site domain. |
| 908 | * @param string $path Site path. |
| 909 | * @param string $title Site title. |
| 910 | * @param string $user_login User login name. |
| 911 | * @param string $user_email User email address. |
| 912 | * @param string $key Activation key created in wpmu_signup_blog(). |
| 913 | * @param array $meta Signup meta data. By default, contains the requested privacy setting and lang_id. |
| 914 | */ |
| 915 | apply_filters( 'wpmu_signup_blog_notification_subject', |
| 916 | /* translators: New site notification email subject. 1: Network name, 2: New site URL */ |
| 917 | _x( '[%1$s] Activate %2$s', 'New site notification email subject' ), |
| 918 | $domain, $path, $title, $user_login, $user_email, $key, $meta |
| 919 | ), |
| 920 | $from_name, |
| 921 | esc_url( 'http://' . $domain . $path ) |
| 922 | ); |
| 923 | wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
| 924 | |