<?php abstract class DaysOfWeek { const Sunday = 0; const Monday = 1; const Tuesday = 2; const Wednesday = 3; const Thursday = 4; const Friday = 5; const Saturday = 6; } $working_days = [DaysOfWeek::Monday, DaysOfWeek::Tuesday, DaysOfWeek::Wednesday, DaysOfWeek::Thursday, DaysOfWeek::Friday]; $today = (int)date('w'); echo in_array($today, $working_days) ? 'Today is a working day!' : 'Today is a weekend day!';
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