Site Health: Account for missing or slashed $_SERVER data in WP_Debug_Data.

Developed in #10870

Follow-up to [56056], [45156], [44986]

Props vishalkakadiya, sabernhardt, peterwilsoncc, mukesh27, westonruter.
Fixes #64599.


git-svn-id: https://develop.svn.wordpress.org/trunk@61606 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-admin/includes/class-wp-debug-data.php

@@ -373,8 +373,8 @@ private static function get_wp_server(): array {
 		);
 		$fields['httpd_software']      = array(
 			'label' => __( 'Web server' ),
-			'value' => $_SERVER['SERVER_SOFTWARE'] ?? __( 'Unable to determine what web server software is used' ),
-			'debug' => $_SERVER['SERVER_SOFTWARE'] ?? 'unknown',
+			'value' => ! empty( $_SERVER['SERVER_SOFTWARE'] ) ? wp_unslash( $_SERVER['SERVER_SOFTWARE'] ) : __( 'Unable to determine what web server software is used' ),
+			'debug' => ! empty( $_SERVER['SERVER_SOFTWARE'] ) ? wp_unslash( $_SERVER['SERVER_SOFTWARE'] ) : 'unknown',
 		);
 		$fields['php_version']         = array(
 			'label' => __( 'PHP version' ),
@@ -545,7 +545,7 @@ private static function get_wp_server(): array {
 		);
 		$fields['server-time'] = array(
 			'label' => __( 'Current Server time' ),
-			'value' => wp_date( 'c', $_SERVER['REQUEST_TIME'] ),
+			'value' => isset( $_SERVER['REQUEST_TIME'] ) ? wp_date( 'c', (int) $_SERVER['REQUEST_TIME'] ) : __( 'Unable to determine server time' ),
 		);
 
 		return array(