PHP mysqli fetch_fields() 函数
示例 - 面向对象的样式
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
$mysqli = new mysqli("localhost","my_user","my_password","my_db");
if ($mysqli -> connect_errno) {
echo "Failed to connect to MySQL: " .
$mysqli -> connect_error;
exit();
}
$sql = "SELECT Lastname, Age FROM Persons ORDER BY Lastname";
if ($result = $mysqli -> query($sql)) {
// Get field information for all fields
$fieldinfo =
$result -> fetch_fields();
foreach ($fieldinfo as
$val) {
printf("Name: %s\n", $val -> name);
printf("Table: %s\n", $val -> table);
printf("Max. Len: %d\n", $val -> max_length);
}
$result
-> free_result();
}
$mysqli -> close();
?>
查看底部的程序样式示例。
定义和用法
fetch_fields() / mysqli_fetch_fields() 函数返回结果集中代表字段（列）的对象的数组。
语法
面向对象的风格:
$mysqli_result -> fetch_fields()
程序风格:
mysqli_fetch_fields(result)
参数值
| 参数 | 描述 |
|---|---|
| result | 必需。规定由 mysqli_query()、mysqli_store_result() 或 mysqli_use_result() 返回的结果集标识符。 |
技术细节
| 返回值: | 返回包含字段定义信息的对象。如果没有可用信息则返回 FALSE。该对象有下列属性:
|
|---|---|
| PHP 版本: | 5+ |
示例 - 程序样式
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
$con = mysqli_connect("localhost","my_user","my_password","my_db");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit();
}
$sql = "SELECT Lastname, Age FROM Persons ORDER BY Lastname";
if ($result = mysqli_query($con , $sql)) {
// Get field information for all fields
$fieldinfo = mysqli_fetch_fields($result);
foreach ($fieldinfo as $val) {
printf("Name: %s\n", $val->name);
printf("Table: %s\n", $val->table);
printf("Max. Len: %d\n", $val->max_length);
}
mysqli_free_result($result);
}
mysqli_close($con);
?>
❮ PHP MySQLi 参考手册
