network_step1( false|WP_Error $errors = false )

113function network_step1( $errors = false ) {114	global $is_apache;115 116	if ( defined( 'DO_NOT_UPGRADE_GLOBAL_TABLES' ) ) {117		$cannot_define_constant_message  = '<strong>' . __( 'Error:' ) . '</strong> ';118		$cannot_define_constant_message .= sprintf(119			/* translators: %s: DO_NOT_UPGRADE_GLOBAL_TABLES */120			__( 'The constant %s cannot be defined when creating a network.' ),121			'<code>DO_NOT_UPGRADE_GLOBAL_TABLES</code>'122		);123 124		wp_admin_notice(125			$cannot_define_constant_message,126			array(127				'additional_classes' => array( 'error' ),128			)129		);130 131		echo '</div>';132		require_once ABSPATH . 'wp-admin/admin-footer.php';133		die();134	}135 136	$active_plugins = get_option( 'active_plugins' );137	if ( ! empty( $active_plugins ) ) {138		wp_admin_notice(139			'<strong>' . __( 'Warning:' ) . '</strong> ' . sprintf(140				/* translators: %s: URL to Plugins screen. */141				__( 'Please <a href="%s">deactivate your plugins</a> before enabling the Network feature.' ),142				admin_url( 'plugins.php?plugin_status=active' )143			),144			array( 'type' => 'warning' )145		);146		echo '<p>' . __( 'Once the network is created, you may reactivate your plugins.' ) . '</p>';147		echo '</div>';148		require_once ABSPATH . 'wp-admin/admin-footer.php';149		die();150	}151 152	// Strip standard port from hostname.153	$hostname = preg_replace( '/(?::80|:443)$/', '', get_clean_basedomain() );154 155	echo '<form method="post">';156 157	wp_nonce_field( 'install-network-1' );158 159	$error_codes = array();160	if ( is_wp_error( $errors ) ) {161		$network_created_error_message = '<p><strong>' . __( 'Error: The network could not be created.' ) . '</strong></p>';162		foreach ( $errors->get_error_messages() as $error ) {163			$network_created_error_message .= "<p>$error</p>";164		}165		wp_admin_notice(166			$network_created_error_message,167			array(168				'additional_classes' => array( 'error' ),169				'paragraph_wrap'     => false,170			)171		);172		$error_codes = $errors->get_error_codes();173	}174 175	if ( ! empty( $_POST['sitename'] ) && ! in_array( 'empty_sitename', $error_codes, true ) ) {176		$site_name = $_POST['sitename'];177	} else {178		/* translators: %s: Default network title. */179		$site_name = sprintf( __( '%s Sites' ), get_option( 'blogname' ) );180	}181 182	if ( ! empty( $_POST['email'] ) && ! in_array( 'invalid_email', $error_codes, true ) ) {183		$admin_email = $_POST['email'];184	} else {185		$admin_email = get_option( 'admin_email' );186	}187	?>188	<p><?php _e( 'Welcome to the Network installation process!' ); ?></p>189	<p><?php _e( 'Fill in the information below and you&#8217;ll be on your way to creating a network of WordPress sites. Configuration files will be created in the next step.' ); ?></p>190	<?php191 192	if ( isset( $_POST['subdomain_install'] ) ) {