What can use for DateTime::diff() for PHP 5.2?

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Spudley’s answer doesn’t work for me–subtracting any DateTime from another gives 0 on my system.

I was able to get it to work by using DateTime::format with the ‘U’ specifier (seconds since Unix epoch):

$start = new DateTime('2010-10-12');
$end = new DateTime();
$days = round(($end->format('U') - $start->format('U')) / (60*60*24));

This works on both my dev system (5.3.4) and my deployment system (5.2.11).

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