What is the function provided in the forum thread for determining the next quarter start date in PHP?

The issue at hand is determining the start date of the next quarter in PHP. One way to solve this is by using the `strtotime` function along with the `date` function to calculate the next quarter start date based on the current date.

$currentDate = date('Y-m-d');
$currentQuarter = ceil(date('n') / 3);
$nextQuarterStart = date('Y-m-d', strtotime('+'. (4 - $currentQuarter) . ' months', strtotime($currentDate)));

echo "Next quarter starts on: " . $nextQuarterStart;