mysql_field_lenSynopsis
Descriptionmysql_field_len() reports the maximum length of the specified field in a result set returned by mysql_db_query() or mysql_query() . The field_offset argument specifies the desired column. The field offset starts at 0. For BLOB, CHARACTER,DATE,ENUM, and NUMERIC field types, the number returned is the maximum number of bytes that can occupy a field. For SET type columns, the length of the column is equivalent to each element in the SET column separated by single commas; for example, a set containing 'FOO','BAR','BAZ' would return a length of 11, which is the length of the stringFOO,BAR,BAZ. ExampleExample 811. Display the names and maximum lengths of the fields in a query <?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'); // Simple SELECT query $query = "SELECT * FROM user"; // Run the query $mysql_result = @ mysql_query ($query) or die ("Query '$query' failed with error message: \"" . mysql_error () . '"'); // Display the names and max lengths of the fields for ($offset = 0; $offset < mysql_num_fields ($mysql_result); ++$offset) { echo '<b>', mysql_field_name ($mysql_result, $offset), ':</b> ', mysql_field_len ($mysql_result, $offset), '<br />'; } ?>
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
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