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The DBDATE environment variable seems to be not recognized by pdo_informix module, so the date-values are displayed in wrong date-format.
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We have the same problem here with PHP 5.3.6 and PDO_INFORMIX 1.2.6
We've been diagnosing this issue for the last couple of days.
We are currently using PDO_INFORMIX 1.2.7 and php 5.3.3. It turns out that if we link PDO_INFORMIX against Informix CSDK 2.90, DBDATE environment variable is recognized and return the expected results
> php -f test.php
[fecha] => 2013-12-01
 => 2013-12-01
> DBDATE=dmy4 php -f test.php
[fecha] => 01/12/2013
 => 01/12/2013
On the other hand, if we link PDO_INFORMIX against CSDK 3.70, it behaves like it is described in this bug.
Related To: Bug #77129