PHP mysqli_fetch_fields() 函数
mysqli_fetch_fields() 函数返回结果集中代表字段(列)的对象的数组。
返回结果集中代表字段(列)的对象的数组,然后输出每个字段名称、表格和最大长度:
<?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(); } $sql="SELECT name,url FROM websites ORDER BY alexa"; if ($result=mysqli_query($con,$sql)) { // 获取所有字段的信息 $fieldinfo=mysqli_fetch_fields($result); foreach ($fieldinfo as $val) { printf("字段名: %s",$val->name); echo "<br>"; printf("数据表: %s",$val->table); echo "<br>"; printf("最大长度: %d",$val->max_length); echo "<br>"; } // 释放结果集 mysqli_free_result($result); } mysqli_close($con); ?>