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run code in 200+ php & hhvm versions
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<?php var_dump(strtotime('1969-12-30')); var_dump(strtotime('0000-00-00 00:00:00'));
based on 1rMlm
Output for 5.2.6 - 7.2.0
int(-176400) int(-62169985172)
Output for 5.2.4 - 5.2.5
int(-176400) bool(false)
Output for 4.3.0 - 5.2.3
int(-176400) int(943916400)