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run code in 200+ php & hhvm versions
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<?php print_r(strtotime('2015-05-05')); echo strtotime('2015-05-05 00:00:00'); echo strtotime('2015-05-05 12:00:00'); echo strtotime('2015-05-05 24:00:00');
Output for 5.3.0 - 7.2.0
1430776800143077680014308200001430863200
Output for 5.1.0 - 5.2.17
143077680014307768001430820000
Output for 4.3.0 - 5.0.5
143077680014307768001430820000-1