Get the number of columns for the most recent query in PHP

//from   w  w  w .  j  a  v  a 2s  .  c  om
<?php
    $con=mysqli_connect("localhost","root","","test");
    // Check connection
    if (mysqli_connect_errno()){
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }

    mysqli_query($con,"SELECT * FROM employee");
    // Get number of columns - will always return 3
    mysqli_field_count($con);

    mysqli_close($con);
?>