in this code it prints 24 arrays with [0]as a diamond number [1] as team1 and [2] as team2, only 16 teams can play twice in one week, and the 16 that didnt play needs to play twice next week.When i test the code, it doesnt do that...some teams play twice in one game (which it cant do either)...could someone point out why? <? function gcd($a, $b) { if ($a == 0 || $b == 0) return max($a, $b); if ($a > $b) return gcd($b, $a); if (!($b % $a)) return $a; return gcd($a, $b % $a); } function lcm($a, $b) { return $b * $a / gcd($a, $b); } ?> <html> <head> <style>body{font:10pt Tahoma;}</style> <body> <?php $teams = 32; $diamonds = 6; $diamond_slots = 4; $teams_played = array(); //the teams that have played already=> [0] and how many times =>[1] $timesplayed = lcm($diamonds * $diamond_slots, $teams) / $teams; $weeksneeded = lcm($diamonds * $diamond_slots, $teams) / (($diamonds * $diamond_slots) * 2); $i = 1; while ($i <= $weeksneeded) { $j = 1; $slot_count = 0; $game = array(); $d = 1; // prefill arrays while ($d <= $diamonds * $diamond_slots) { $game[$d] = array(1 => 0); $d++; } $d = 1; while ($d <= $teams) { $teams_played[$d] = array(0 => 0, 1 => 0); $d++; } print "Week " . $i . ":<br>"; print "<b>Diamond - Team1 - Team2</b><br>"; while ($j <= $diamonds * $diamond_slots) { srand(); $diamond_rnd = rand(1, $diamonds); //check for slots over 5 for ($row = 1; $row <= count($game); $row++) { if ($game[$row][0] == $diamond_rnd) { ++$slot_count; } } while ($slot_count > $diamond_slots - 1) { srand(); $diamond_rnd = rand(1, $diamonds); $slot_count = 0; for ($row = 1; $row <= count($game); $row++) { if ($game[$row][0] == $diamond_rnd) { ++$slot_count; } } } // randomize teams & check to make sure they arent the same. $team1_rnd = rand(1, $teams); $team2_rnd = rand(1, $teams); // while ($team1_rnd == $team2_rnd) { //checking again in case 2nd or 3rd while changes it while ($team1_rnd == $team2_rnd) { $team1_rnd = rand(1, $teams); $team2_rnd = rand(1, $teams); } // check to see if teams have already played if ($j <= ($teams / 2)) { //since 2 teams will play each game while ($teams_played[$team1_rnd][1] >= $i) { $team1_rnd = rand(1, $teams); } while ($teams_played[$team2_rnd][1] >= $i) { $team2_rnd = rand(1, $teams); } } // } // insert random numbers into array // check to see if theres an identical array for ($row = 1; $row <= count($game); $row++) { if ($game[$row] == array($diamond_rnd, $team1_rnd, $team2_rnd)) { $result = true; } else { $result = false; } } for ($d = 1; $d <= count($game); $d++) { if (($game[$d][1] && $game[$d][2]) == ($game[$team1_rnd][2] && $game[$team2_rnd][1])) { $result2 == true; } } if (($result == true) || ($result2 == true) || ($result3 == true)) { $slot_count = 0; //dont add 1 to $j } elseif ($result == false) { $teams_played[$team1_rnd] = array(0 => $team1_rnd, 1 => 1); $teams_played[$team2_rnd] = array(0 => $team2_rnd, 1 => 1); $game[$j] = array($diamond_rnd, $team1_rnd, $team2_rnd); print '$game[' . $j . ']:'; print_r($game[$j]); print "<br>"; $j++; $slot_count = 0; } flush(); } print "<br><br>"; $i++; } ?> Code (markup):