PHP Compatibility Index

Is Login by Auth0 compatible with PHP 8?

Version 4.6.2 · 10,000+ active installs · requires PHP 7.4

Works on PHP 8.0–8.5, with deprecation notices from 8.4

No removed PHP features found in Login by Auth0 4.6.2. It uses 2 deprecated feature(s) that only log notices today.

PHP 8.0
✓
PHP 8.1
✓
PHP 8.2
✓
PHP 8.3
✓
PHP 8.4
⚠ 2
PHP 8.5
⚠ 2

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

Not updated for 2.3 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.
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Deprecated (works today, logs notices)

File:lineWhat
lib/WP_Auth0_Ip_Check.php:100Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $a0_options.
lib/WP_Auth0_Routes.php:38Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $ip_check.

Plugin page on WordPress.org: auth0