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run code in 150+ php & hhvm versions
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<?php $key = 2; echo date('Y-m-d', strtotime('-'.$key.' days')) . '-' . date('Y-m-d', strtotime('+'.(7-$key).' days')); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
2014-02-02-2014-02-09