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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 |
---|---|
1879 | $subject = __( 'New %1$s User: %2$s' ); |
1880 |
|
1881 | /** |
1882 | * Filters the subject of the welcome email after user activation. |
1883 | * |
1884 | * @since MU (3.0.0) |
1885 | * |
1886 | * @param string $subject Subject of the email. |
1887 | */ |
1888 | $subject = apply_filters( 'update_welcome_user_subject', sprintf( $subject, $current_network->site_name, $user->user_login ) ); |
1889 |
|
1890 | wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
1891 |
|
1892 | if ( $switched_locale ) { |
1893 | restore_previous_locale(); |
1894 | } |
1895 |
|
1896 | return true; |
1897 | } |