PHP mysqli_field_seek () function

PHP MySQLi Reference Manual

Setting the result set the first field (column) field pointer, then () Gets field information through mysqli_fetch_field and output field names, and the maximum length of the table:

<?php 
// 假定数据库用户名：root，密码：123456，数据库：w3big 
$con=mysqli_connect("localhost","root","123456","w3big"); 
if (mysqli_connect_errno($con)) 
{ 
    echo "连接 MySQL 失败: " . mysqli_connect_error(); 
} 

$sql="SELECT name,url FROM websites ORDER BY alexa";

if ($result=mysqli_query($con,$sql))
{
	// 获取第一列 ("name") 的字段信息
	mysqli_field_seek($result,0);
	$fieldinfo=mysqli_fetch_field($result);

	printf("字段名: %s",$fieldinfo->name);
	echo "<br>";
	printf("表名: %s",$fieldinfo->table);
	echo "<br>";
	printf("字段长度: %d",$fieldinfo->max_length);

	// 释放结果集
	mysqli_free_result($result);
}

mysqli_close($con);
?>

Definition and Usage

mysqli_field_seek () function pointer is set to the field offset specified field.

grammar

technical details