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<?php var_dump(mktime(12, 00, 00)); var_dump(strtotime('12:00 pm')); var_dump(strtotime('01:23')); var_dump(date('H:i:s', strtotime('12:00 pm') + strtotime('01:23')));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
int(1408010400) int(1408010400) int(1407972180) string(8) "10:23:00"
Output for 7.3.32 - 7.3.33, 8.0.13
int(1408017600) int(1408017600) int(1407979380) string(8) "13:23:00"

preferences:
253.47 ms | 401 KiB | 344 Q