3v4l.org

run code in 200+ php & hhvm versions
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<?php echo strtotime('-1 month -1 day');
based on 3fXug
Output for 5.6.28, 7.0.20 - 7.2.0
1440175929
Output for 7.0.6
1459606561
Output for 7.0.5
1456890480
Output for 7.0.4
1455031269
Output for 7.0.3
1455725005
Output for 7.0.2
1456092613
Output for 7.0.1
1456194276
Output for 7.0.0
1456460506
Output for 5.6.21
1459502783
Output for 5.6.20
1457491529
Output for 5.6.19
1454800098
Output for 5.6.18
1455436786
Output for 5.6.17
1455825179
Output for 5.6.16
1456549795
Output for 5.6.15
1456639276
Output for 5.6.14
1456819179
Output for 5.6.13
1457957703
Output for 5.6.12
1458355142
Output for 5.6.11
1458637866
Output for 5.6.10
1458817522
Output for 5.6.9
1459008773
Output for 5.6.8
1459209319
Output for 5.5.35
1461248646
Output for 5.5.34
1457585974
Output for 5.5.33
1454897328
Output for 5.5.32
1455622779
Output for 5.5.31
1455921580
Output for 5.5.30
1456732484
Output for 5.5.29
1458095826
Output for 5.5.28
1458452999
Output for 5.5.27
1458546440
Output for 5.5.26
1458913549
Output for 5.5.25
1459107219
Output for 5.5.24
1461378058
Output for 5.4.34 - 5.4.45
1440175935
Output for 5.4.20 - 5.4.32
1440175936
Output for 5.4.8 - 5.4.19
1440175937
Output for 5.4.7
1443226468
Output for 5.4.6
1443231808
Output for 5.4.5
1443237151
Output for 5.4.4
1443237405
Output for 5.4.3
1443243383
Output for 5.4.2
1443249518
Output for 5.4.1
1443255967
Output for 5.3.29
1440185160
Output for 5.3.28
1440185159
Output for 5.3.26 - 5.3.27
1440185158
Output for 5.3.24 - 5.3.25
1440185157
Output for 5.3.22 - 5.3.23
1440185156
Output for 5.3.21
1440185155
Output for 5.3.19 - 5.3.20
1440185154
Output for 5.3.18
1440185153