PHP mysql_num_fields() 函数

mysql_num_fields($data) 函数返回结果集中字段的数。

<?php$con = mysql_connect("localhost", "hello", "321");if (!$con)  {  die('Could not connect: ' . mysql_error());  }$db_selected = mysql_select_db("test_db",$con);$sql = "SELECT * FROM person";$result = mysql_query($sql,$con);echo mysql_num_fields($result);mysql_close($con);?>