I would like to propose the picoSQL db support in PHP.
picoSQL supports the ODBC APIs, so you need to change only
the following two files (you can get further informations
at www.picosoft.it/picosql or you can email me):

--- php-4.3.1/ext/odbc/php_odbc_includes.h      Wed Jul 31 15:51:20 2002
+++ php-4.3.1/ext/odbc/php_odbc_includes.h.new  Wed Apr 30 17:04:45 2003
@@ -179,6 +179,12 @@
 #include <LibraryManager.h>
 #endif

+#elif defined(HAVE_PICOSQL) /* PICOSQL */
+#define ODBC_TYPE "picoSQL"
+#define HAVE_SQL_EXTENDED_FETCH 1
+#include <odbcsql.h>
+# define SQL_MAX_MESSAGE_LENGTH 512
+
 #else /* MS ODBC */

 #define HAVE_SQL_EXTENDED_FETCH 1


--- php-4.3.1/ext/odbc/config.m4        Tue Nov 12 18:31:39 2002
+++ php-4.3.1/ext/odbc/config.m4.new    Wed Apr 30 16:50:00 2003
@@ -534,6 +534,36 @@
 ])
 fi

+if test -z "$ODBC_TYPE"; then
+AC_MSG_CHECKING(for picoSQL support)
+AC_ARG_WITH(picoSQL,
+[  --with-picoSQL[=DIR]   Include picoSQL support.  DIR is the
+                          picoSQL base install directory, defaults to
+                          /usr/local.],
+[
+  PHP_WITH_SHARED
+  if test "$withval" = "yes"; then
+    withval=/usr/local
+  fi
+  if test "$withval" != "no"; then
+    PHP_ADD_LIBRARY_WITH_PATH(picocpp, $withval/lib)
+    PHP_ADD_LIBRARY_WITH_PATH(picoiiop, $withval/lib)
+    PHP_ADD_LIBRARY_WITH_PATH(picosqlnet, $withval/lib)
+    PHP_ADD_INCLUDE($withval/inc, 1)
+    ODBC_TYPE=picoSQL
+    ODBC_INCLUDE=-I$withval/inc
+    ODBC_LFLAGS=-L$withval/lib
+    ODBC_LIBS=-lpicosqlnet -lpicoiiop -lpicocpp
+    AC_DEFINE(HAVE_PICOSQL,1,[ ])
+    AC_MSG_RESULT(yes)
+  else
+    AC_MSG_RESULT(no)
+  fi
+],[
+  AC_MSG_RESULT(no)
+])
+fi
+
 if test -n "$ODBC_TYPE"; then
   if test "$ODBC_TYPE" != "dbmaker"; then
     if test "$shared" != "yes"; then