Online PHP editor | refs for cINuR

<?php function calculateRoutes($points){ //our output array $out = array(); //reset the index of our points to ensure they are 0 to N-1 $points = array_values($points); //loop over the points once for($i=0; $i<count($points) - 1; $i++){ //loop over the points again, offset by 1 for($j=$i+1; $j<count($points); $j++){ //add to our output array the two points $out[] = array($points[$i], $points[$j]); } } //return the final result return $out; } $points = array('A', 'B', 'C', 'D'); $routes = calculateRoutes($points); print_r($routes);