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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 |
|---|---|
| 1234 | $admin_email = 'support@' . $_SERVER['SERVER_NAME']; |
| 1235 | |
| 1236 | $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); |
| 1237 | $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
| 1238 | $message = $welcome_email; |
| 1239 | |
| 1240 | if ( empty( $current_site->site_name ) ) |
| 1241 | $current_site->site_name = 'WordPress'; |
| 1242 | |
| 1243 | $subject = apply_filters( 'update_welcome_subject', sprintf(__('New %1$s Site: %2$s'), $current_site->site_name, wp_unslash( $title ) ) ); |
| 1244 | wp_mail($user->user_email, $subject, $message, $message_headers); |
| 1245 | return true; |
| 1246 | } |
| 1247 | |
| 1248 | /** |
| 1249 | * Notify a user that her account activation has been successful. |
| 1250 | * |
| 1251 | * Filter 'wpmu_welcome_user_notification' to disable or bypass. |
| 1252 | * |