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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 |
|---|---|
| 933 | * |
| 934 | * @since MU |
| 935 | * |
| 936 | * @param string $subject Subject of the notification email. |
| 937 | * @param string $user_login User login name. |
| 938 | * @param string $user_email User email address. |
| 939 | * @param string $key Activation key created in wpmu_signup_user(). |
| 940 | * @param array $meta Signup meta data. |
| 941 | */ |
| 942 | apply_filters( 'wpmu_signup_user_notification_subject', |
| 943 | /* translators: New user notification email subject. 1: Network name, 2: New user login */ |
| 944 | _x( '[%1$s] Activate %2$s', 'New user notification email subject' ), |
| 945 | $user_login, $user_email, $key, $meta |
| 946 | ), |
| 947 | $from_name, |
| 948 | $user_login |
| 949 | ); |
| 950 | wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
| 951 | |