PHP and MySQL - can't select database -

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I'm trying to use a database 'coolometer I tried to connect to it like this: 

  $ con = mysqli_connect ("localhost", "x", "x", "coolometer") or die ("can not connect");   
 But this is just a 'no database selected' suggestion?   
 
 
 I think your MySQLi extension is disabled, so you first need to check var_dump ( Function_exists ('mysqli_connect')); If it outputs to bool (false), then you have to enable the MySQLi extension.

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