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mysql_num_fields
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mysql_num_fields

Name

mysql_num_fields — Gets the number of fields in a MySQL result handle.

Synopsis

int mysql_num_fields(result_handle); mysql result result_handle: Result handle returned by mysql_db_query() or mysql_query()

Returns

Integer; NULL on error

Description

mysql_num_fields() returns the number of fields that exist in each row of a MySQL result handle.

Version

PHP 3+, PHP 4+

Example

Example 821. Find out how many fields of data exist within a row

<?php
// Included code that connects to a MySQL server and sets a default database
// See the MySQL Functions chapter introduction for the source code for the file
include ('mysql_connect.inc.php');

// Get the current time and UNIX timestamp
$query = "SELECT * FROM user";

// Suppress errors for each line below with a single at (@) symbol
$mysql_result = @ mysql_query ($query);
$num_fields = @ mysql_num_fields ($mysql_result);

// Use the strict comparison operator to check whether $num_rows contains NULL
if (NULL === $num_fields)
   die ("Query '$query' failed with error message: \"" . mysql_error () . '"');

echo "Query '$query' returned $num_fields field(s) of data per row.";
?>

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PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.