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run code in 150+ php & hhvm versions
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<?php echo strtotime("January");
Output for 5.6.28, 7.0.14 - 7.1.0
1390345200
Output for 7.0.6
1451775600
Output for 7.0.5
1451689200
Output for 5.6.20, 7.0.4
1452294000
Output for 7.0.3
1453071600
Output for 5.5.27, 5.5.35, 7.0.2
1453330800
Output for 7.0.1
1453503600
Output for 7.0.0
1453762800
Output for 5.6.14, 5.6.21
1451602800
Output for 5.6.19
1452034800
Output for 5.6.13, 5.6.18
1452726000
Output for 5.6.12, 5.6.17
1453158000
Output for 5.6.9, 5.6.16
1453849200
Output for 5.5.25, 5.6.15
1453935600
Output for 5.6.11
1453417200
Output for 5.6.7, 5.6.10
1453590000
Output for 5.6.8
1454022000
Output for 5.5.34
1452380400
Output for 5.5.33
1452207600
Output for 5.5.32
1452812400
Output for 5.2.0 - 5.4.45, 5.5.28, 5.5.31
1453244400
Output for 5.5.30
1454194800
Output for 5.5.29
1452898800
Output for 5.5.26
1453676400
Output for 5.5.24
1454108400
Output for 5.1.0 - 5.1.6
Output for 4.3.0 - 5.0.5
-1