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<?php 
// Assume database username: root, password: 123456, database: tutorialpro 
$con = mysqli_connect("localhost", "root", "123456", "tutorialpro"); 
if (mysqli_connect_errno($con)) 
{ 
    echo "Failed to connect to MySQL: " . mysqli_connect_error(); 
} 

// ...some PHP code to query the "tutorialpro" database...

// Change database to "test"
mysqli_select_db($con, "test");

// ...some PHP code to query the "test" database...

mysqli_close($con);
?>