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run code in 200+ php & hhvm versions
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<?php var_dump(strtotime("-3 month"));
based on oHq1P
Output for 5.6.0 - 5.6.12, 5.6.14 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
int(1491532450)
Output for 5.6.13
int(1491532451)