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<?php $days = ['Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday']; $inputDays = ['Sunday','Friday']; $missingDays = array_diff($days,$inputDays); print_r($missingDays);
Output for 7.1.0 - 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Array ( [0] => Monday [1] => Tuesday [2] => Wednesday [3] => Thursday [5] => Saturday )
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218.51 ms | 408 KiB | 5 Q