Networks and Sites: Extract into a new function the email that gets sent to the network administrator when a new site is created, and introduce filters to disable and modify its

contents.

* The `send_new_site_email` filter can be used to disable this email.
* The `new_site_email` filter can be used to modify its contents.

Props Dhruvin, Dharm1025, dharmin16, jipmoors

Fixes #42134


git-svn-id: https://develop.svn.wordpress.org/trunk@49127 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/network/site-new.php

@@ -145,31 +145,7 @@ if ( isset( $_REQUEST['action'] ) && 'add-site' === $_REQUEST['action'] ) {
 			update_user_option( $user_id, 'primary_blog', $id, true );
 		}
 
-		wp_mail(
-			get_site_option( 'admin_email' ),
-			sprintf(
-				/* translators: New site notification email subject. %s: Network title. */
-				__( '[%s] New Site Created' ),
-				get_network()->site_name
-			),
-			sprintf(
-				/* translators: New site notification email. 1: User login, 2: Site URL, 3: Site title. */
-				__(
-					'New site created by %1$s
-
-Address: %2$s
-Name: %3$s'
-				),
-				$current_user->user_login,
-				get_site_url( $id ),
-				wp_unslash( $title )
-			),
-			sprintf(
-				'From: "%1$s" <%2$s>',
-				_x( 'Site Admin', 'email "From" field' ),
-				get_site_option( 'admin_email' )
-			)
-		);
+		wpmu_new_site_admin_notification( $id, $user_id );
 		wpmu_welcome_notification( $id, $user_id, $password, $title, array( 'public' => 1 ) );
 		wp_redirect(
 			add_query_arg(