Why does an error appear when accessing fetch?

Question

// Get a single query result

public static function fetch($sql){

return $this->conn->query($sql)->fetch( PDO::FETCH_ASSOC);

}

Error:

Fatal error: Using $this when not in object context in D:\Web\api\Db.php on line 79

Answer 1

Check it, it should be that there are a few more curly braces in front of this method, causing your fetch to be defined outside the class, so this situation occurs

Answer 2

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Answer 3

Can I take a screenshot of the entire page of code?

Answer 4

Fatal error, there is no such object in the $this context, view the content of the variable