Answers for "php date format get day number of week"

php get day of week

date('w'); //gets day of week as number(0=sunday,1=monday...,6=sat)

//note:returns 0 through 6 but as string so to check if monday do this:
if(date('w') == 1){
	echo "its monday baby";
}

php createFromFormat day of week

<?php
$date = DateTime::createFromFormat('Y-m-d', '2018-06-21');
echo $date->format('l'); # l for full week day name
?>