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<?php $x = strtotime('2014-01-01') - strtotime('2014-01-01'); var_dump(strtotime('2014-01-01')); var_dump($x);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1388530800) int(0)