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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 |
|---|---|
| 917 | * |
| 918 | * @since MU |
| 919 | * |
| 920 | * @param string $subject Subject of the notification email. |
| 921 | * @param string $user User login name. |
| 922 | * @param string $user_email User email address. |
| 923 | * @param string $key Activation key created in wpmu_signup_user(). |
| 924 | * @param array $meta Signup meta data. |
| 925 | */ |
| 926 | apply_filters( 'wpmu_signup_user_notification_subject', |
| 927 | __( '[%1$s] Activate %2$s' ), |
| 928 | $user, $user_email, $key, $meta |
| 929 | ), |
| 930 | $from_name, |
| 931 | $user |
| 932 | ); |
| 933 | wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
| 934 | return true; |
| 935 | } |