To execute a query in a MySQL database using PHP, you can use the mysqli_query function like $result = mysqli_query($conn, ______);.

To execute a query in a MySQL database using PHP and the mysqli extension, you would use the mysqli_query function. It takes two parameters: the connection object ($conn) and the SQL query you want to execute. The function returns a result object ($result in this case) that can be used to retrieve data or perform other database operations. Ensure you have a valid SQL query stored in a variable ($sql_query in this case) and pass it as the second parameter to mysqli_query. This allows PHP to execute the query against the connected MySQL database.