Description:
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From manual page: http://www.php.net/function.mysql-fetch-field#refsect1-function.mysql-fetch-field-returnvalues
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http://www.w3schools.com/php/func_mysql_fetch_field.asp
(Purpose: Some reference back to $meta->def)

The field - def - does not contain the default value of the mysql column - even if the default values were defined in the table.

(PS - The new/upgraded version of PHP manual simply hide this field)

I have used PHP 5.3.5 from XAMPP 1.7 version.

Test script:
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type:         $meta->type
default:      $meta->def
unique_key:   $meta->unique_key

Here, the default value is always missing or returning empty variable.

Expected result:
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Default value assiged to the mysql column while creating it using: DEFAULT 'XXX'.

For example,
`is_active` enum('N','Y') NOT NULL DEFAULT 'N' COMMENT 'Active record?',

Here, for the field is_active, we should have seen 'N'