PHP mysqli_field_tell() 函数

<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";

if ($result=mysqli_query($con,$sql))
{

// Get field info for all fields
while ($fieldinfo=mysqli_fetch_field($result))
{
// Get field cursor position
$currentfield=mysqli_field_tell($result);

printf("Column %d:n", $currentfield);
printf("Name: %sn", $fieldinfo->name);
printf("Table: %sn", $fieldinfo->table);
}

// Free result set
mysqli_free_result($result);
}

mysqli_close($con);
?>