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# mysql_field_name

(PHP 3, PHP 4 , PHP 5)

mysql_field_name -- Get the name of the specified field in a result

## Description

string mysql_field_name ( resource result, int field_index )

mysql_field_name() returns the name of the specified field index. result must be a valid result identifier and field_index is the numerical offset of the field.

> 注: field_index starts at 0.

> e.g. The index of the third field would actually be 2, the index of the fourth field would be 3 and so on.

> 注: 此函數傳回的欄位是有大小寫之分。

範例 1. mysql_field_name() example

`<?php
/* The users table consists of three fields:
* user_id
* username
* password.
*/
$link = @mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect to MySQL server: ' . mysql_error());
}
$dbname = 'mydb';
$db_selected = mysql_select_db($dbname, $link);
if (!$db_selected) {
die('Could not set $dbname: ' . mysql_error());
}
$res = mysql_query('select * from users', $link);
echo mysql_field_name($res, 0) . "\n";
echo mysql_field_name($res, 2);
?>`

The above example would produce the following output:

    user_id
    password

For downwards compatibility mysql_fieldname() can also be used. This is deprecated, however.

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