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In order to have these functions available, you must compile PHP with support for the mysqli extension.

MySQL 8

When running a PHP version before 7.1.16, or PHP 7.2 before 7.2.4, set MySQL 8 Server's default password plugin to mysql_native_password or else you will see errors similar to The server requested authentication method unknown to the client [caching_sha2_password] even when caching_sha2_password is not used.

This is because MySQL 8 defaults to caching_sha2_password, a plugin that is not recognized by the older PHP (mysqlnd) releases. Instead, change it by setting default_authentication_plugin=mysql_native_password in my.cnf. The caching_sha2_password plugin will be supported in a future PHP release. In the meantime, the mysql_xdevapi extension does support it.

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alvaro at demogracia dot com
1 month ago
Supported authentication methods are listed in the "Loaded plugins" row of the "mysqlnd" section in phpinfo(). Look for plugins that start with "auth_plugin_…".
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