Online PHP editor | output for qLAvm

<?php class BS_Dijkstra { private $_mapGraph; private $_startId; private $_mapDistance = array(); private $_mapPrevious = array(); public function __construct($mapGraph, $startId) { $this->_mapGraph = $mapGraph; $this->setStart($startId); } public function setStart($startId) { $this->_startId = $startId; $visited = array(); $this->_mapDistance = array(); $this->_mapPrevious = array(); foreach($this->_mapGraph AS $key => $location) { $this->_mapDistance[$key] = INF; $visited[$key] = false; $this->_mapPrevious[$key] = null; } $Q = array(); if(!isset($this->_mapGraph[$startId])) { return; } else { $Q[$startId] = $this->_mapGraph[$startId]; $this->_mapDistance[$startId] = 0; } while(count($Q) > 0) { $u = null; foreach($Q as $key => $unvisited) { if($u === null || $this->_mapDistance[$key] < $this->_mapDistance[$u]) { $u = $key; } } unset($Q[$u]); $visited[$u] = true; foreach($this->_mapGraph[$u] as $gateway) { list($target, $distance) = $gateway; $alt = $this->_mapDistance[$u] + $distance; if(!isset($this->_mapDistance[$target]) || $alt < $this->_mapDistance[$target]) { $this->_mapDistance[$target] = $alt; $this->_mapPrevious[$target] = $u; if(!$visited[$target]) { $Q[$target] = $this->_mapGraph[$target]; } } } } } public function getDistance($nodeId) { return isset($this->_mapDistance[$nodeId]) ? $this->_mapDistance[$nodeId] : INF; } public function getDistanceMap() { return $this->_mapDistance; } public function getDistanceMapWithin($max) { return $this->getDistanceMapBetween(0,$max); } public function getDistanceMapBetween($min, $max) { $map = array(); foreach($this->_mapDistance as $key => $distance) { if($distance <= $max && $distance >= $min) { $map[$key] = $distance; } } return $map; } public function getRoute($endId) { $path = array(); $u = $endId; while(isset($this->_mapPrevious[$u])) { array_unshift($path, $u); $u = $this->_mapPrevious[$u]; } array_unshift($path, $u); return $path; } } $graph = 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$start = 1; $finish = 164; $d = new BS_Dijkstra($graph, 1); print("Route from $start to $finish\n"); print_r($d->getRoute($finish)); print("Distance from $start to $finish\n"); print_r($d->getDistance($finish));