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run code in 200+ php & hhvm versions
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<?php echo strtotime( 'last day of last month' );
Output for 5.6.28, 7.0.20 - 7.2.0
1451575961
Output for 7.0.6
1462018178
Output for 7.0.5
1459411442
Output for 7.0.4
1456780283
Output for 7.0.3
1456786012
Output for 7.0.2
1456721654
Output for 7.0.1
1456732554
Output for 7.0.0
1456739321
Output for 5.6.21
1462028290
Output for 5.6.20
1459407950
Output for 5.6.19
1456723279
Output for 5.6.18
1456755659
Output for 5.6.17
1456710788
Output for 5.6.16
1456742308
Output for 5.6.15
1456745297
Output for 5.6.14
1459440654
Output for 5.6.13
1459443007
Output for 5.6.12
1459408845
Output for 5.6.11
1459431994
Output for 5.6.10
1459439524
Output for 5.6.9
1459459239
Output for 5.6.8
1459403244
Output for 5.5.35
1461978639
Output for 5.5.34
1459416026
Output for 5.5.33
1456734399
Output for 5.5.32
1456770029
Output for 5.5.31
1456722462
Output for 5.5.30
1459426760
Output for 5.5.29
1459408047
Output for 5.5.28
1459420810
Output for 5.5.27
1459426640
Output for 5.5.26
1459449241
Output for 5.5.25
1459389651
Output for 5.5.24
1462005171
Output for 5.4.44 - 5.4.45
1451575964
Output for 5.4.41 - 5.4.43
1451575965
Output for 5.4.40
1451575966
Output for 5.4.38 - 5.4.39
1451575967
Output for 5.4.36 - 5.4.37
1451575968
Output for 5.4.34 - 5.4.35
1451575969
Output for 5.3.29, 5.4.31 - 5.4.32
1451575970
Output for 5.4.26 - 5.4.30
1451575971
Output for 5.4.23 - 5.4.25
1451575972
Output for 5.3.28, 5.4.20 - 5.4.22
1451575973
Output for 5.3.27, 5.4.17 - 5.4.19
1451575974
Output for 5.3.24 - 5.3.26, 5.4.13 - 5.4.16
1451575975
Output for 5.3.22 - 5.3.23, 5.4.12
1451575976