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<?php $startBookTime = new DateTime(); echo intval($startBookTime->format('H')) < 18 ; var_dump(intval($startBookTime->format('H')) < 19);
Output for 5.5.32, 5.6.13, 5.6.28, 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
bool(true)
Output for 5.5.24 - 5.5.25, 5.5.27 - 5.5.31, 5.5.33 - 5.5.35, 5.6.8, 5.6.10 - 5.6.12, 5.6.14 - 5.6.21, 7.0.0 - 7.0.2, 7.0.5 - 7.0.6, 7.3.32 - 7.3.33, 8.0.13
1bool(true)
Output for 5.5.26, 5.6.9, 7.0.3 - 7.0.4
bool(false)

preferences:
161.06 ms | 402 KiB | 214 Q