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<?php $d = new DateTime('2015-01-01'); $a = array(new DateTime('2015-01-01'), new DateTime('2015-02-01')); echo in_array($d, $a) ? 'yes' : 'no';
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
yes

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157.1 ms | 404 KiB | 194 Q