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run code in 150+ php & hhvm versions
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<?php $halfYearAgo = new \DateTime(); $halfYearAgo = $halfYearAgo->sub(new \DateInterval('P6M')); echo $halfYearAgo->format('Y-m-d');
Output for 5.6.28, 7.0.14 - 7.1.0
2012-08-25
Output for 7.0.6
2015-11-03
Output for 5.6.14, 7.0.5
2015-10-02
Output for 7.0.4
2015-09-10
Output for 7.0.3
2015-09-18
Output for 7.0.2
2015-09-22
Output for 7.0.1
2015-09-23
Output for 7.0.0
2015-09-26
Output for hhvm-3.12.0
2015-09-11
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.6.21
2015-11-02
Output for 5.6.20
2015-10-09
Output for 5.6.19
2015-09-07
Output for 5.6.18
2015-09-14
Output for 5.6.17
2015-09-19
Output for 5.6.16
2015-09-27
Output for 5.6.15
2015-09-28
Output for 5.6.13
2015-10-15
Output for 5.6.12
2015-10-19
Output for 5.6.11
2015-10-23
Output for 5.6.10
2015-10-25
Output for 5.6.9
2015-10-27
Output for 5.6.8
2015-10-29
Output for 5.6.7
2015-11-25
Output for 5.5.35
2015-11-22
Output for 5.5.34
2015-10-10
Output for 5.5.33
2015-09-08
Output for 5.5.32
2015-09-16
Output for 5.5.31
2015-09-20
Output for 5.5.30
2015-10-01
Output for 5.5.29
2015-10-16
Output for 5.5.28
2015-10-20
Output for 5.5.27
2015-10-21
Output for 5.5.26
2015-10-26
Output for 5.5.25
2015-10-28
Output for 5.5.24
2015-11-23
Output for 5.3.0 - 5.4.45
2015-05-18
Output for 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rpjiv on line 3 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rpjiv on line 4 Fatal error: Call to undefined method DateTime::sub() in /in/Rpjiv on line 4
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rpjiv on line 3 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rpjiv on line 4 Fatal error: Class 'DateTime' not found in /in/Rpjiv on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rpjiv on line 3 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rpjiv on line 4 Fatal error: Cannot instantiate non-existent class: datetime in /in/Rpjiv on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rpjiv on line 3 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Rpjiv on line 4 Fatal error: Cannot instantiate non-existent class: datetime in /in/Rpjiv on line 3