PHP mysqli_field_tell() 函数

实例

取得所有字段的字段信息，然后通过 mysqli_field_tell() 取得当前字段并输出字段名称、表格和最大长度：

 <?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);
 ?>