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PhpDig is a PHP MySQL based
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mysql_field_len — Gets the maximum length of the specified column in a result set.


int mysql_field_len(result handle, field_offset);
mysql result result handle: Result handle returned by mysql_db_query() or mysql_query()
int field_offset: Field offset to use


Integer; FALSE on error


mysql_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.


PHP 3+, PHP 4+

See also

To find the actual lengths of the fields in a row:



Example 811. Display the names and maximum lengths of the fields in a query

// 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 ('');

// 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 in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from 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.

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