PHP and MYSQLI configuration related problems wow speed solver

PHP and mysqli configuration problems wow speed Solver
Fatal Error:call to a member function execute () on a non-object in E:\yaoke\function\function_common.php on line 510

As long as the website uses this fetch_object and this fetch_array () is wrong

Solve Wow


Local environment Wamp no mistake.
But there's been a mistake on the server. This environment is installed on the server phpstudyadmin


------Solution--------------------
Put out your code and look.
------Solution--------------------
$mysqli is not instantiated!
That was not in the previous code.
$mysqli = new Mysqli ()
------Solution--------------------
This is a problem with the SQL query.
$result = $mysqli->query ($sql); An error occurred in the SQL statement, resulting in $result not returning the Mysqli_stmt object as expected.
Focus on checking if there are wk (' config_new ') tables in the current database, and columns named ID
------Solution--------------------
Check the return value of each function, which step returns false.

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