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# ifx_num_fields

(PHP 3 >= 3.0.3, PHP 4, PHP 5)

ifx_num_fields -- Returns the number of columns in the query

## 说明

int ifx_num_fields ( resource result_id )

After preparing or executing a query, this call gives you the number of columns in the query.

## 参数

`result_id`

  `result_id` is a valid resultid returned by ifx_query() or ifx_prepare() (select type queries only!).

## 返回值

Returns the number of columns in query for `result_id`, or `FALSE` on errors.

## 范例

例 1. ifx_num_fields() Example

`<?php $conn_id = ifx_connect("db", "user", "password"); $res_id = ifx_query("select * from systables", $conn_id); echo ifx_num_fields($res_id); ?>`

## 参见

ifx_num_rows()

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