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run code in 150+ php & hhvm versions
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<?php echo strtotime("next monday", strtotime("2012-01-01")); ?>
Output for 4.4.0 - 4.4.9, 5.0.5 - 7.1.0
1325458800
Output for 4.3.0 - 4.3.11, 5.0.0 - 5.0.4
1326063600