PHP Compatibility Index

Is Health Check & Troubleshooting compatible with PHP 8?

Version 1.7.1 · 200,000+ active installs · requires PHP 5.6

No PHP 8.0–8.5 problems found

No removed or deprecated PHP features found in Health Check & Troubleshooting 1.7.1 for PHP 8.0 to 8.5.

PHP 8.0
✓
PHP 8.1
✓
PHP 8.2
✓
PHP 8.3
✓
PHP 8.4
✓
PHP 8.5
✓

✓ no problems · ⚠ deprecation notices only (still works) · ✗ uses something removed in that PHP version

Not updated for 2.2 years. Nobody seems to maintain this plugin, so problems found here are unlikely to be fixed. If your site uses it, look for a maintained alternative before upgrading PHP.
Check your whole site, not just one plugin. The free PHP Upgrade Check plugin scans every plugin and theme you have installed (including premium and custom ones) and explains each problem. It runs on any host.

Removed long ago or protected by a check (code that most likely never runs on PHP 8)

File:lineWhat
HealthCheck/BackCompat/class-wp-debug-data.php:762Function mysql_get_client_info() is deprecated since PHP 5.5 and removed since PHP 7.0

Plugin page on WordPress.org: health-check