Description:
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DateTime objects are not properly retrieved from the cache. Attempting to work with the object results in a failure.

I'm accessing the sample code via a web page.

Reproduce code:
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<?php

date_default_timezone_set('Europe/Berlin');
	
$d = new DateTime();
print( $d->format(DateTime::W3C) . "\n" );
apc_store( 'q1', $d );
print( apc_fetch( 'q1' )->format( DateTime::W3C ) . "\n" );

?>

Expected result:
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The same datetime should be printed twice.

Actual result:
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( ! ) Warning: DateTime::format() [function.DateTime-format]: The DateTime object has not been correctly initialized by its constructor in /home/projects/Current/vmed/web/test/datetime.php on line 7