Hi,
This warning is not wierd. It simply tells you that what you use - in this case mysql - is outdated.
function mysql_connectIt is therefore necessary, as indicated in the message, to use "mysqli" instead.
To do so, do not forget to validate the mysqli PHP extension:
Wampmanager->PHP->PHP extensions->php_mysqli
Most errors can be resolved easily by reading the error message itself. And then: RTFM!
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons