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MySQL 8.4 no longer enables the mysql_native_password plugin by default, affecting PHP and other applications that use this authentication method. This change leads to connection errors. Updating the MySQL user to use caching_sha2_password can resolve these issues. It is possible, though not recommended, to re-enable mysql_native_password on MySQL 8.4 by modifying the configuration file. The plugin is completely removed in MySQL 9.0, making this workaround invalid in future versions.

How to fix mysql_native_password not loaded errors on MySQL 8.4

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How to fix mysql_native_password not loaded errors on MySQL 8.4

This doesn’t strike me as a PHP specific issue, rather one that is specific to MySQL servers and agnostic to backend programming languages.
Great for those having issues with MySQL though.