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run code in 200+ php & hhvm versions
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<?php echo strtotime("7 days ago");
based on mdroA
Output for 5.6.25, 7.3.0rc3
1498544811
Output for 5.6.0 - 5.6.24, 5.6.26 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0beta1
1498544810