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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 |
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839 | * @param string $subject Subject of the notification email. |
840 | * @param string $domain Site domain. |
841 | * @param string $path Site path. |
842 | * @param string $title Site title. |
843 | * @param string $user_login User login name. |
844 | * @param string $user_email User email address. |
845 | * @param string $key Activation key created in wpmu_signup_blog(). |
846 | * @param array $meta By default, contains the requested privacy setting and lang_id. |
847 | */ |
848 | apply_filters( 'wpmu_signup_blog_notification_subject', |
849 | /* translators: New site notification email subject. 1: Network name, 2: New site URL */ |
850 | _x( '[%1$s] Activate %2$s', 'New site notification email subject' ), |
851 | $domain, $path, $title, $user_login, $user_email, $key, $meta |
852 | ), |
853 | $from_name, |
854 | esc_url( 'http://' . $domain . $path ) |
855 | ); |
856 | wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
857 |
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