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# mysql_num_fields

(PHP 3, PHP 4 , PHP 5)

mysql_num_fields -- Get number of fields in result

## Description

int mysql_num_fields ( resource result)

mysql_num_fields() returns the number of fields in the result set result.

示範 1.A mysql_num_fields() example
`<?php $result = mysql_query("SELECT id,email FROM people WHERE id = '42'"); if (!$result) { echo 'Could not run query: ' . mysql_error(); exit; } /* returns 2 because id,email === two fields */ echo mysql_num_fields($result); ?>`

For downward compatibility mysql_numfields() can also be used. This is deprecated however.

See also mysql_select_db(), mysql_query(), mysql_fetch_field() and mysql_num_rows().

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