Easy one:
$today = date('l'); // returns Sunday
When you want it to do like your image, you should get your date from the dropdown. Then do the following:
$date="2017-7-27 10:51:10"; // example date
var_dump(date('l', strtotime($date))); // returns Sunday
Goodluck!
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solved Display which day it is? sunday or monday “php coding”? [closed]