WP_USE_EXT_MYSQL

This constant is actually never defined in core code at all. You can define it yourself in wp-config.php configuration if you need to, but core doesn’t need it defined for normal operation. It only exists for re–configuring into running untypical setup.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)