Looping through all the days in the current month with PHP.

This loop will start at the first day of the current month with each loop adding 1 day, the loop will continue until the current month is no longer less than or equal to the last looped day/date.

<?php
$date = date('F Y');//Current Month Year
while (strtotime($date) <= strtotime(date('Y-m') . '-' . date('t', strtotime($date)))) {
    $date = date("Y-m-d", strtotime("+1 day", strtotime($date)));//Adds 1 day onto current date
}

Now to add in some formatted DateTime values:

$day_num = date('j', strtotime($date));//Day number
$day_name = date('l', strtotime($date));//Day name
$day_abrev = date('S', strtotime($date));//th, nd, st and rd
$day = "$day_name $day_num$day_abrev";

The full script:

<?php
$date = date('F Y');//Current Month Year
while (strtotime($date) <= strtotime(date('Y-m') . '-' . date('t', strtotime($date)))) {
    $day_num = date('j', strtotime($date));//Day number
    $day_name = date('l', strtotime($date));//Day name
    $day_abrev = date('S', strtotime($date));//th, nd, st and rd
    $day = "$day_name $day_num $day_abrev";
    $date = date("Y-m-d", strtotime("+1 day", strtotime($date)));//Adds 1 day onto current date
    echo $day . '<br>';
}

This will output (As for October 2020):

Thursday 1st
Friday 2nd
Saturday 3rd
Sunday 4th
Monday 5th
Tuesday 6th
Wednesday 7th
Thursday 8th
...

You can change the date formating with values from here.