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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 |
|---|---|
| 1072 | * |
| 1073 | * @since MU (3.0.0) |
| 1074 | * |
| 1075 | * @param string $subject Subject of the notification email. |
| 1076 | * @param string $user_login User login name. |
| 1077 | * @param string $user_email User email address. |
| 1078 | * @param string $key Activation key created in wpmu_signup_user(). |
| 1079 | * @param array $meta Signup meta data. Default empty array. |
| 1080 | */ |
| 1081 | apply_filters( |
| 1082 | 'wpmu_signup_user_notification_subject', |
| 1083 | /* translators: New user notification email subject. 1: Network name, 2: New user login */ |
| 1084 | _x( '[%1$s] Activate %2$s', 'New user notification email subject' ), |
| 1085 | $user_login, |
| 1086 | $user_email, |
| 1087 | $key, |
| 1088 | $meta |
| 1089 | ), |
| 1090 | $from_name, |