PHP mysql_num_fields() 函數

mysql_num_fields($data) 函數返回結果集中字段的數。

<?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);
?>