<form method="POST">
    <h3>Editing: site-new.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
/**
 * Add Site Administration Screen
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.1.0
 */

/** Load WordPress Administration Bootstrap */
require_once __DIR__ . '/admin.php';

/** WordPress Translation Installation API */
require_once ABSPATH . 'wp-admin/includes/translation-install.php';

if ( ! current_user_can( 'create_sites' ) ) {
	wp_die( __( 'Sorry, you are not allowed to add sites to this network.' ) );
}

get_current_screen()-&gt;add_help_tab(
	array(
		'id'      =&gt; 'overview',
		'title'   =&gt; __( 'Overview' ),
		'content' =&gt;
			'&lt;p&gt;' . __( 'This screen is for Super Admins to add new sites to the network. This is not affected by the registration settings.' ) . '&lt;/p&gt;' .
			'&lt;p&gt;' . __( 'If the admin email for the new site does not exist in the database, a new user will also be created.' ) . '&lt;/p&gt;',
	)
);

get_current_screen()-&gt;set_help_sidebar(
	'&lt;p&gt;&lt;strong&gt;' . __( 'For more information:' ) . '&lt;/strong&gt;&lt;/p&gt;' .
	'&lt;p&gt;' . __( '&lt;a href=&quot;https://developer.wordpress.org/advanced-administration/multisite/admin/#network-admin-sites-screen&quot;&gt;Documentation on Site Management&lt;/a&gt;' ) . '&lt;/p&gt;' .
	'&lt;p&gt;' . __( '&lt;a href=&quot;https://wordpress.org/support/forum/multisite/&quot;&gt;Support forums&lt;/a&gt;' ) . '&lt;/p&gt;'
);

if ( isset( $_REQUEST['action'] ) &amp;&amp; 'add-site' === $_REQUEST['action'] ) {
	check_admin_referer( 'add-blog', '_wpnonce_add-blog' );

	if ( ! is_array( $_POST['blog'] ) ) {
		wp_die( __( 'Cannot create an empty site.' ) );
	}

	$blog   = $_POST['blog'];
	$domain = '';

	$blog['domain'] = trim( $blog['domain'] );
	if ( preg_match( '|^([a-zA-Z0-9-])+$|', $blog['domain'] ) ) {
		$domain = strtolower( $blog['domain'] );
	}

	// If not a subdomain installation, make sure the domain isn't a reserved word.
	if ( ! is_subdomain_install() ) {
		$subdirectory_reserved_names = get_subdirectory_reserved_names();

		if ( in_array( $domain, $subdirectory_reserved_names, true ) ) {
			wp_die(
				sprintf(
					/* translators: %s: Reserved names list. */
					__( 'The following words are reserved for use by WordPress functions and cannot be used as site names: %s' ),
					'&lt;code&gt;' . implode( '&lt;/code&gt;, &lt;code&gt;', $subdirectory_reserved_names ) . '&lt;/code&gt;'
				)
			);
		}
	}

	$title = $blog['title'];

	$meta = array(
		'public' =&gt; 1,
	);

	// Handle translation installation for the new site.
	if ( isset( $_POST['WPLANG'] ) ) {
		if ( '' === $_POST['WPLANG'] ) {
			$meta['WPLANG'] = ''; // en_US
		} elseif ( in_array( $_POST['WPLANG'], get_available_languages(), true ) ) {
			$meta['WPLANG'] = $_POST['WPLANG'];
		} elseif ( current_user_can( 'install_languages' ) &amp;&amp; wp_can_install_language_pack() ) {
			$language = wp_download_language_pack( wp_unslash( $_POST['WPLANG'] ) );
			if ( $language ) {
				$meta['WPLANG'] = $language;
			}
		}
	}

	if ( empty( $title ) ) {
		wp_die( __( 'Missing site title.' ) );
	}

	if ( empty( $domain ) ) {
		wp_die( __( 'Missing or invalid site address.' ) );
	}

	if ( isset( $blog['email'] ) &amp;&amp; '' === trim( $blog['email'] ) ) {
		wp_die( __( 'Missing email address.' ) );
	}

	$email = sanitize_email( $blog['email'] );
	if ( ! is_email( $email ) ) {
		wp_die( __( 'Invalid email address.' ) );
	}

	if ( is_subdomain_install() ) {
		$newdomain = $domain . '.' . preg_replace( '|^www\.|', '', get_network()-&gt;domain );
		$path      = get_network()-&gt;path;
	} else {
		$newdomain = get_network()-&gt;domain;
		$path      = get_network()-&gt;path . $domain . '/';
	}

	$password = 'N/A';
	$user_id  = email_exists( $email );
	if ( ! $user_id ) { // Create a new user with a random password.
		/**
		 * Fires immediately before a new user is created via the network site-new.php page.
		 *
		 * @since 4.5.0
		 *
		 * @param string $email Email of the non-existent user.
		 */
		do_action( 'pre_network_site_new_created_user', $email );

		$user_id = username_exists( $domain );
		if ( $user_id ) {
			wp_die( __( 'The domain or path entered conflicts with an existing username.' ) );
		}
		$password = wp_generate_password( 12, false );
		$user_id  = wpmu_create_user( $domain, $password, $email );
		if ( false === $user_id ) {
			wp_die( __( 'There was an error creating the user.' ) );
		}

		/**
		 * Fires after a new user has been created via the network site-new.php page.
		 *
		 * @since 4.4.0
		 *
		 * @param int $user_id ID of the newly created user.
		 */
		do_action( 'network_site_new_created_user', $user_id );
	}

	$wpdb-&gt;hide_errors();
	$id = wpmu_create_blog( $newdomain, $path, $title, $user_id, $meta, get_current_network_id() );
	$wpdb-&gt;show_errors();

	if ( ! is_wp_error( $id ) ) {
		if ( ! is_super_admin( $user_id ) &amp;&amp; ! get_user_option( 'primary_blog', $user_id ) ) {
			update_user_option( $user_id, 'primary_blog', $id, true );
		}

		wpmu_new_site_admin_notification( $id, $user_id );
		wpmu_welcome_notification( $id, $user_id, $password, $title, array( 'public' =&gt; 1 ) );
		wp_redirect(
			add_query_arg(
				array(
					'update' =&gt; 'added',
					'id'     =&gt; $id,
				),
				'site-new.php'
			)
		);
		exit;
	} else {
		wp_die( $id-&gt;get_error_message() );
	}
}

if ( isset( $_GET['update'] ) ) {
	$messages = array();
	if ( 'added' === $_GET['update'] ) {
		$messages[] = sprintf(
			/* translators: 1: Dashboard URL, 2: Network admin edit URL. */
			__( 'Site added. &lt;a href=&quot;%1$s&quot;&gt;Visit Dashboard&lt;/a&gt; or &lt;a href=&quot;%2$s&quot;&gt;Edit Site&lt;/a&gt;' ),
			esc_url( get_admin_url( absint( $_GET['id'] ) ) ),
			network_admin_url( 'site-info.php?id=' . absint( $_GET['id'] ) )
		);
	}
}

// Used in the HTML title tag.
$title       = __( 'Add Site' );
$parent_file = 'sites.php';

wp_enqueue_script( 'user-suggest' );

require_once ABSPATH . 'wp-admin/admin-header.php';

?&gt;

&lt;div class=&quot;wrap&quot;&gt;
&lt;h1 id=&quot;add-new-site&quot;&gt;&lt;?php _e( 'Add Site' ); ?&gt;&lt;/h1&gt;
&lt;?php
if ( ! empty( $messages ) ) {
	$notice_args = array(
		'type'        =&gt; 'success',
		'dismissible' =&gt; true,
		'id'          =&gt; 'message',
	);

	foreach ( $messages as $msg ) {
		wp_admin_notice( $msg, $notice_args );
	}
}
?&gt;
&lt;p&gt;&lt;?php echo wp_required_field_message(); ?&gt;&lt;/p&gt;
&lt;form method=&quot;post&quot; action=&quot;&lt;?php echo esc_url( network_admin_url( 'site-new.php?action=add-site' ) ); ?&gt;&quot; novalidate=&quot;novalidate&quot;&gt;
&lt;?php wp_nonce_field( 'add-blog', '_wpnonce_add-blog' ); ?&gt;
	&lt;table class=&quot;form-table&quot; role=&quot;presentation&quot;&gt;
		&lt;tr class=&quot;form-field form-required&quot;&gt;
			&lt;th scope=&quot;row&quot;&gt;
				&lt;label for=&quot;site-address&quot;&gt;
					&lt;?php
					_e( 'Site Address (URL)' );
					echo ' ' . wp_required_field_indicator();
					?&gt;
				&lt;/label&gt;
			&lt;/th&gt;
			&lt;td&gt;
			&lt;?php if ( is_subdomain_install() ) { ?&gt;
				&lt;input name=&quot;blog[domain]&quot; type=&quot;text&quot; class=&quot;regular-text ltr&quot; id=&quot;site-address&quot; aria-describedby=&quot;site-address-desc&quot; autocapitalize=&quot;none&quot; autocorrect=&quot;off&quot; required /&gt;&lt;span class=&quot;no-break&quot;&gt;.&lt;?php echo preg_replace( '|^www\.|', '', get_network()-&gt;domain ); ?&gt;&lt;/span&gt;
				&lt;?php
			} else {
				echo get_network()-&gt;domain . get_network()-&gt;path
				?&gt;
				&lt;input name=&quot;blog[domain]&quot; type=&quot;text&quot; class=&quot;regular-text ltr&quot; id=&quot;site-address&quot; aria-describedby=&quot;site-address-desc&quot; autocapitalize=&quot;none&quot; autocorrect=&quot;off&quot; required /&gt;
				&lt;?php
			}
			echo '&lt;p class=&quot;description&quot; id=&quot;site-address-desc&quot;&gt;' . __( 'Only lowercase letters (a-z), numbers, and hyphens are allowed.' ) . '&lt;/p&gt;';
			?&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr class=&quot;form-field form-required&quot;&gt;
			&lt;th scope=&quot;row&quot;&gt;
				&lt;label for=&quot;site-title&quot;&gt;
					&lt;?php
					_e( 'Site Title' );
					echo ' ' . wp_required_field_indicator();
					?&gt;
				&lt;/label&gt;
			&lt;/th&gt;
			&lt;td&gt;&lt;input name=&quot;blog[title]&quot; type=&quot;text&quot; class=&quot;regular-text&quot; id=&quot;site-title&quot; required /&gt;&lt;/td&gt;
		&lt;/tr&gt;
		&lt;?php
		$languages    = get_available_languages();
		$translations = wp_get_available_translations();
		if ( ! empty( $languages ) || ! empty( $translations ) ) :
			?&gt;
			&lt;tr class=&quot;form-field form-required&quot;&gt;
				&lt;th scope=&quot;row&quot;&gt;&lt;label for=&quot;site-language&quot;&gt;&lt;?php _e( 'Site Language' ); ?&gt;&lt;/label&gt;&lt;/th&gt;
				&lt;td&gt;
					&lt;?php
					// Network default.
					$lang = get_site_option( 'WPLANG' );

					// Use English if the default isn't available.
					if ( ! in_array( $lang, $languages, true ) ) {
						$lang = '';
					}

					wp_dropdown_languages(
						array(
							'name'                        =&gt; 'WPLANG',
							'id'                          =&gt; 'site-language',
							'selected'                    =&gt; $lang,
							'languages'                   =&gt; $languages,
							'translations'                =&gt; $translations,
							'show_available_translations' =&gt; current_user_can( 'install_languages' ) &amp;&amp; wp_can_install_language_pack(),
						)
					);
					?&gt;
				&lt;/td&gt;
			&lt;/tr&gt;
		&lt;?php endif; // Languages. ?&gt;
		&lt;tr class=&quot;form-field form-required&quot;&gt;
			&lt;th scope=&quot;row&quot;&gt;
				&lt;label for=&quot;admin-email&quot;&gt;
					&lt;?php
					_e( 'Admin Email' );
					echo ' ' . wp_required_field_indicator();
					?&gt;
				&lt;/label&gt;
			&lt;/th&gt;
			&lt;td&gt;&lt;input name=&quot;blog[email]&quot; type=&quot;email&quot; class=&quot;regular-text wp-suggest-user&quot; id=&quot;admin-email&quot; data-autocomplete-type=&quot;search&quot; data-autocomplete-field=&quot;user_email&quot; aria-describedby=&quot;site-admin-email&quot; required /&gt;&lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr class=&quot;form-field&quot;&gt;
			&lt;td colspan=&quot;2&quot; class=&quot;td-full&quot;&gt;&lt;p id=&quot;site-admin-email&quot;&gt;&lt;?php _e( 'A new user will be created if the above email address is not in the database.' ); ?&gt;&lt;br /&gt;&lt;?php _e( 'The username and a link to set the password will be mailed to this email address.' ); ?&gt;&lt;/p&gt;&lt;/td&gt;
		&lt;/tr&gt;
	&lt;/table&gt;

	&lt;?php
	/**
	 * Fires at the end of the new site form in network admin.
	 *
	 * @since 4.5.0
	 */
	do_action( 'network_site_new_form' );

	submit_button( __( 'Add Site' ), 'primary', 'add-site' );
	?&gt;
	&lt;/form&gt;
&lt;/div&gt;
&lt;?php
require_once ABSPATH . 'wp-admin/admin-footer.php';
</textarea><br>
    <input type="submit" value="Save">
</form>