Hello,

it finally worked using  iODBC driver  instead of unixODBC. To do that i recompiled and linked php to use  iODBC  following  this tutorial : http://www.iodbc.org/dataspace/doc/iodbc/wiki/iodbcWiki/IODBCPHPHOWTO

but adapting some code:

installing first,

  intersystems driver . 

and this packages:  libxml2-dev ,  iodbc ,  libiodbc2-dev  from the repository.

for apache:

./configure --prefix=/usr/local/apache --enable-module=so --enable-mods-shared=mod_so

for php

./configure --enable-discard-path --with-layout=GNU --without-mysql --with-iodbc=/usr/include/iodbc --with-apxs2=/usr/local/apache/bin/apxs --without-ldap --enable-opcache=no