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<?php $d1 = new DateTime('-1 month'); $d2 = new DateTime('-1 month'); var_dump($d2==$d1);
Output for 7.1.0 - 7.1.2, 7.1.5 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
bool(false)
Output for 7.0.0 - 7.0.20, 7.1.3
bool(true)

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105.68 ms | 401 KiB | 172 Q