PHP mysqli_fetch_fields()Functions

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Returns an array of objects representing the fields (columns) in the result set, then outputs each field name, table, and maximum length:

<?php 
// 假定数据库用户名：root，密码：123456，数据库：EXAMPLE 
$con=mysqli_connect("localhost","root","123456","EXAMPLE"); 
if (mysqli_connect_errno($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);
?>

Definition and Usage

The mysqli_fetch_fields() function returns an array of objects representing fields (columns) in a result set.

Syntax

mysqli_fetch_fields(result);

Parameters Description
result Required. Specifies the result set identifier returned by mysqli_query(), mysqli_store_result(), or mysqli_use_result().

Technical Details

Return Value: Returns an object containing field definition information. Returns FALSE if no available information. The object has the following properties:
  • name - The column name
  • orgname - The original column name (if an alias is specified)
  • table - The table name
  • orgtable - The original table name (if an alias is specified)
  • max_length - The maximum width of the field
  • length - The field width specified in the table definition
  • charsetnr - The character set number of the field
  • flags - The bit flags of the field
  • type - The data type used for the field
  • decimals - The number of digits after the decimal point (for integer fields)
PHP Version: 5+

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