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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 |
---|---|
1001 | * |
1002 | * @since MU (3.0.0) |
1003 | * |
1004 | * @param string $subject Subject of the notification email. |
1005 | * @param string $user_login User login name. |
1006 | * @param string $user_email User email address. |
1007 | * @param string $key Activation key created in wpmu_signup_user(). |
1008 | * @param array $meta Signup meta data. Default empty array. |
1009 | */ |
1010 | apply_filters( 'wpmu_signup_user_notification_subject', |
1011 | /* translators: New user notification email subject. 1: Network name, 2: New user login */ |
1012 | _x( '[%1$s] Activate %2$s', 'New user notification email subject' ), |
1013 | $user_login, $user_email, $key, $meta |
1014 | ), |
1015 | $from_name, |
1016 | $user_login |
1017 | ); |
1018 | wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
1019 |
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