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mysql_field_flags — Gets the flags associated with a particular field in a result handle.


string mysql_field_flags(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


String of space-separated flag names; FALSE on error


mysql_field_flags() returns any flags that are associated with a particular field in a mysql result handle returned by mysql_db_query() or mysql_query() .The flags are returned as a string of flag names separated by single spacesflag1 flag2 flag3 ...)

The field_offset argument specifies the desired column. The field offset starts at0.

The following table lists the flags that can be returned.

Flag Name Description
auto_increment The column has the AUTO_INCREMENT attribute set.
binary The column has the BINARY attribute set. This is set by default for BLOB-type columns.
blob The column is a BLOB type.
enum The column is an ENUM column. Note that there is no corresponding set flag.
multiple_key The column is part of a multi-key index.
not_null The column has the NOT NULL attribute set.
primary_key The column is the PRIMARY KEY.
timestamp The column is a TIMESTAMP column.
unique_key The column has the UNIQUE attribute set.
unsigned The column has the UNSIGNED attribute set.
zerofill The column has the ZEROFILL attribute set.


PHP 3+, PHP 4+

See also

To get more comprehensive information about a field:



Example 810. Use mysql_field_flags() to find out whether the primary key is part of 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 () . '"');

// Loop through each field, grabbing the field flags
for ($offset = 0; $offset < mysql_num_fields ($mysql_result); ++$offset) {

   // Get the field flags string
   $field_flags = mysql_field_flags ($mysql_result, $offset);

   // Look for 'primary_key' in the string
   if (strstr ($field_flags, 'primary_key')) {
      die ("Field '" . mysql_field_name ($mysql_result, $offset) . "' is the primary key.");

echo "Query '$query' does not contain the column that is the primary key.";

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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