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run code in 150+ php & hhvm versions
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<?php echo strtotime('4242'); echo date(71698576791); ?>
Output for 5.2.6 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
7169857324171698576791
Output for 5.1.0 - 5.2.5
71698576791
Output for 4.3.0 - 5.0.5
-171698576791