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Output for 5.3.29, 5.4.25 - 5.4.32, 5.5.9 - 5.6.0, php7@20140507 - 20140801, hhvm-3.0.1 - 3.2.0
int(1393628400) March
Output for php7@20140901
int(1391727600) February
Output for 5.2.0 - 5.3.28, 5.4.0 - 5.4.24, 5.5.0 - 5.5.8
int(1391554800) February
Output for 5.1.0 - 5.1.6
bool(false) January
Output for 4.3.0 - 5.0.5
int(-1) December