PHPmysqli_field_count()函数

php 
// 假定数据库用户名：root，密码：123456，数据库：RUNOOB 
$con=mysqli_connect("localhost","root","123456","RUNOOB"); 
if (mysqli_connect_errno($con)) 
{ 
    echo "连接 MySQL 失败: " . mysqli_connect_error(); 
} 

mysqli_query($con,"SELECT * FROM websites");

// 获取列数
echo mysqli_field_count($con);


mysqli_close($con);
?>