Description:
------------
The PHP function odbc_fetch_array returns uninitialized values for PostgreSQL boolean values.  On older systems, this function returned '1' for true and '0' for false values.  On our 64 bit system, the boolean values appear to be uninitialized data.

Additional information

Increasing buffer size in php_odbc.c (odbc.so) in function odbc_bindcols, just prior to call to SQLBindCol makes problem stop exhibiting.
SQLColAttributes(...,SQL_COLUMN_TYPE,...) returns type of SQL_VARCHAR on system with problem, SQL_CHAR on system where code works as expected.
SQLColAttributes is deprecated (shouldn't matter, though)

Recreation steps:

// Create table/data in PostgreSQL

DROP TABLE IF EXISTS public.persons;
create table public.persons (id int, name varchar(255), switch_sw boolean);
insert into public.persons values (0, 'smith', true);
insert into public.persons values (1, 'jones', false);
insert into public.persons values (2, 'bailey', true);
insert into public.persons values (3, 'johnson', false);


Software levels

kernel - Linux C921189 3.10.0-123.20.1.el7.x86_64 . . . GNU/Linux
ODBC - libodbc.so.1 (cannot exactly determine version)
PostgreSQL - 9.3.0
PHP - 5.6.7

This system is little endian


Test script:
---------------
<?php

   if(!($conn = odbc_connect("..." , "..." , "...")))
      die("odbc_connect failed\n");

   if(!($rows = odbc_exec($conn, "select * from persons;")))
      die("odbc_exec failed\n");

   for(;;)
   {
      if (!($row = odbc_fetch_array ($rows)))
         break;

      print_r($row);
   }

   odbc_close($conn);
?>


Expected result:
----------------
Array
(
    [id] => 0
    [name] => smith
    [switch_sw] => 1
)
. . .


Actual result:
--------------
Array
(
    [id] => 0
    [name] => smith
    [switch_sw] => . // some unreadable binary content
)
. . .