The php file has the following structure:
<?
	$conn = odbc_connect("tar_CHT", "", "");
	$mapas = odbc_do($conn,"SELECT * FROM Pa?s_Mapas WHERE CStr([ID_Pa?s])=1 ");
?>
...
<? echo odbc_result($mapas,"Codigo_HTML") ?>

Where "tar_CHT" is a system DSN of an Access database, "Pais_Mapas" is a table and "Codigo_HTML" is a memo field. This field sometimes have more than 4K characters.

Working with PHP3:

In PHP3.INI, if i leave the uodbc.defaultlrl parameter in 4096, sometimes the "Codigo_HTML" field is truncated.
I solve the problem changing that value to, for example, 8192.

Working with PHP4:

In PHP.INI, if i change the uodbc.defaultlrl parameter to 8192, the field is still truncated.

Both PHP3.INI and PHP.INI are in the "Winnt" directory.
Other parameters in the .INI files remain with the default values.