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# mysqli_field_count

(PHP 5)

mysqli_field_count

(no version information, might be only in CVS)

mysqli->field_count -- Returns the number of columns for the most recent query

## Description

Procedural style:

int mysqli_field_count ( object link)

Object oriented style (method):

class mysql {
int field_count ( void )
}

Returns the number of columns for the most recent query on the connection represented by the link parameter. This function can be useful when using the mysqli_store_result() function to determine if the query should have produced a non-empty result set or not without knowing the nature of the query.

## Return values

An integer representing the number of fields in a result set

## Example

示範 1.Object oriented style
`<?php $mysqli = new mysqli("localhost", "my_user", "my_password", "test"); $mysqli->query( "DROP TABLE IF EXISTS friends"); $mysqli->query( "CREATE TABLE friends (id int, name varchar(20))"); $mysqli->query( "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')"); $mysqli->real_query($HTTP_POST_VARS['query']); if (mysqli_field_count($link)) { /* this was a select/show or describe query */ $result = $mysqli->store_result(); /* process resultset */ $row = $result->fetch_row(); /* free resultset */ $result->close(); } /* close connection */ $mysqli->close(); ?>`

示範 2.Procedural style
`<?php $link = mysqli_connect("localhost", "my_user", "my_password", "test"); mysqli_query($link, "DROP TABLE IF EXISTS friends"); mysqli_query($link, "CREATE TABLE friends (id int, name varchar(20))"); mysqli_query($link, "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')"); mysqli_real_query($link, $HTTP_POST_VARS['query']); if (mysqli_field_count($link)) { /* this was a select/show or describe query */ $result = mysqli_store_result($link); /* process resultset */ $row = mysqli_fetch_row($result); /* free resultset */ mysqli_free_result($result); } /* close connection */ mysqli_close($link); ?>`

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