Get Click Coordinates based on a normal distribution

Click Coordinates

<?php

// Return Random Float between min and max
function randomFloat($min = 0, $max = 1) {
    return $min + mt_rand() / mt_getrandmax() * ($max - $min);
}

// returns normally distributed coordinates in a given range (0 to nMax)
function getClickCoordinates(&$x, &$y, $xMax = 100, $yMax = 100){

	// Polar-Method to get Normal Distributed coordinates
	do {
		$u = randomFloat(-1,1);
		$v = randomFloat(-1,1);
		$q =$u * $u + $v * $v;
	} while ($q == 0 || $q >= 1);

	$p = sqrt( (-10 * log($q)) / $q);
	
	//Used to normalize numbers between -1 and 1
	$boundary = 10;
	//   |----------------- between -1 and 1 ---------------|
	$x = min(max($u * $p, -$boundary), $boundary) / $boundary * $xMax/2 + $xMax/2; 
	$y = min(max($v * $p, -$boundary), $boundary) / $boundary * $yMax/2 + $yMax/2; 
}


// Output some demo variables for visualization
for ($i=0; $i < 10000 ; $i++) { 
	
	getClickCoordinates($x, $y, 180, 180);
	echo "$x;$y\n";

}

?>