Description:
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The function mssql_field_name() appears to return only the first 30 characters of the field name.

Reproduce code:
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<?
    $sql = 'select 1 as [This is a field name that is longer than 30 characters]';
    $mssqlh = mssql_pconnect ('server', 'username', 'password');    // change as appropriate
    mssql_select_db ('databasename', $mssqlh);                      // change as appropriate
    $result = mssql_query ($sql, $mssqlh);
    $fieldname = mssql_field_name ($result, 0);
    var_export ($fieldname);
?>

Expected result:
----------------
'This is a field name that is longer than 30 characters'

Actual result:
--------------
'This is a field name that is l'