3v4l.org

run code in 200+ php & hhvm versions
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<?php echo strtotime('2015');
Output for 5.3.18 - 5.4.45, 5.6.28, 7.0.20 - 7.2.0
1442427300
Output for 7.0.6
1462299300
Output for 7.0.5
1459707300
Output for 7.0.4
1457637300
Output for 7.0.3
1458328500
Output for 7.0.2
1458674100
Output for 7.0.1
1458846900
Output for 7.0.0
1459102500
Output for 5.6.21
1462212900
Output for 5.6.20
1460312100
Output for 5.6.19
1457378100
Output for 5.6.18
1458069300
Output for 5.6.17
1458414900
Output for 5.6.16
1459188900
Output for 5.6.15
1459275300
Output for 5.6.14
1459620900
Output for 5.6.13
1460744100
Output for 5.6.12
1461176100
Output for 5.6.11
1461435300
Output for 5.6.10
1461608100
Output for 5.6.9
1461780900
Output for 5.6.8
1461953700
Output for 5.5.35
1463940900
Output for 5.5.34
1460398500
Output for 5.5.33
1457550900
Output for 5.5.32
1458242100
Output for 5.5.31
1458501300
Output for 5.5.30
1459534500
Output for 5.5.29
1460916900
Output for 5.5.28
1461262500
Output for 5.5.27
1461348900
Output for 5.5.26
1461694500
Output for 5.5.25
1461867300
Output for 5.5.24
1464113700