PHP5中文手册

实例

假设我们有一个 "Friends" 表，其中有 3 个字段 20 行记录。返回最近查询的列数：

 <?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();
 }

mysqli_query($con,"SELECT * FROM Friends");
// Get number of columns - will always return 3
mysqli_field_count($con);

mysqli_close($con);
 ?>