Description:
------------
serialize don't work on stdClass anymore: nothing is get as return of 
serialize($test) when $test is an object

Test script:
---------------
<?php
	function test_($var) {
		$start = serialize ($var);
		$nb_ok = $nb_nok = 0;
		for ($i = 0; $i < 100; $i ++) {
			$end = serialize(unserialize($start));
			if ($star == $end) {
				$nb_ok++;
			} else {
				$nb_nok++;
			}
		}
		print("<p>".htmlentities($start)."<br />ok=".$nb_ok."<br />nok=".$nb_nok."</p>");
	}
	test_(5);
	test_("254retet");
	test_(array(54,7,687,"ihju",24,"","52s7"));
	$test = new stdClass(); $test->bidule="57geré"; $test->truc=547; $test->machin=54.47; $test->chose="dsf24sdg"; test_($test);
	$test2 = new stdClass(); $test2->first="dflgid"; $test2->second=$test; $test2->third=2; test_($test2);
?>

Expected result:
----------------
i:5;
ok=0
nok=100

s:8:"254retet";
ok=0
nok=100

a:7:
{i:0;i:54;i:1;i:7;i:2;i:687;i:3;s:4:"ihju";i:4;i:24;i:5;s:0:"";i:6;s:4:"52s7";}
ok=0
nok=100

O:8:"stdClass":4:
{s:6:"bidule";s:6:"57geré";s:4:"truc";i:547;s:6:"machin";d:54.469999999999999;s:
5:"chose";s:8:"dsf24sdg";}
ok=0
nok=100

O:8:"stdClass":3:{s:5:"first";s:6:"dflgid";s:6:"second";O:8:"stdClass":4:
{s:6:"bidule";s:6:"57geré";s:4:"truc";i:547;s:6:"machin";d:54.469999999999999;s:
5:"chose";s:8:"dsf24sdg";}s:5:"third";i:2;}
ok=0
nok=100

Actual result:
--------------
i:5;
ok=0
nok=100

s:8:"254retet";
ok=0
nok=100

a:7:
{i:0;i:54;i:1;i:7;i:2;i:687;i:3;s:4:"ihju";i:4;i:24;i:5;s:0:"";i:6;s:4:"52s7";}
ok=0
nok=100


ok=0
nok=100


ok=0
nok=100