Tests: fixed PHP "disable_functions" and "disable_classes" tests.

test/php/date_time/index.php

@@ -1,4 +1,5 @@
 <?php
-$d = new DateTime('2011-01-01T15:03:01.012345Z');
+date_default_timezone_set('Europe/Moscow');
+$d = new DateTime('2011-01-01T15:03:01.012345');
 echo $d->format('u');
 ?>

test/php/highlight_file_exec/index.php

@@ -1,4 +0,0 @@
-<?php
-highlight_file('index.php');
-exec('pwd');
-?>

test/php/time_exec/index.php

@@ -0,0 +1,4 @@
+<?php
+echo 'time: ' . time();
+echo 'exec: ' . exec('pwd');
+?>