Are there specific functions in PHP that can determine which day of the week a particular date falls on?

To determine which day of the week a particular date falls on in PHP, you can use the `date()` function along with the `l` format specifier, which will return the full textual representation of the day of the week. You can pass the date in the desired format as the second parameter to the `date()` function.

$date = '2022-01-01';
$dayOfWeek = date('l', strtotime($date));
echo $dayOfWeek; // Output: Saturday