function check_star_location($x,$y) {


	$star_check3 = "SELECT b_x,b_y FROM planets WHERE x = '".($x)."' AND y = '".($y)."'";
	$star_check2 = mysql_query($star_check3) or trigger_error("SQL", E_USER_ERROR);
	while ($star_check1 = mysql_fetch_assoc($star_check2)) {

				$arr[] = $star_check1;
	}

							$arr = !isset($arr) ? '' : $arr; // prevents undefine error notice

		$star_loop_again = 0;

while ($star_loop_again < 1) {
					// random a new star location
					$b_x = rand(0,570);
					$b_y = rand(0,370);
					$distance = ''; // prevents undefine error notice
		foreach($arr as $db) {

				$db_x = $db['b_x'];
				$db_y = $db['b_y'];
				$distance .= distance($b_x,$b_y,$db_x,$db_y) . "-";

			}

				// explodes distance variable into an array
			$distance_numbers = explode("-", $distance);
			array_pop($distance_numbers);

			// counts how many planets are to close to another star
			$array_distances = array_filter($distance_numbers,"compare_distance");
			$count = count($array_distances);


			// if count is more then 0 then make it loop
	if($count > 0) {

		$star_loop_again = 0;

	}else{

	++$star_loop_again; // increases the counter so its more then 1 so the loop stops since no name matches any names in the data base

	}
}
return array($b_x,$b_y);

}



function compare_distance($v) {

				GLOBAL $star_distance; // grabs global variable
		if ($v < $star_distance) {

	return true;
		}
	return false;
}