PHP实现按之字形顺序打印二叉树的方法_php技巧_

val = $val; } }*/ function MyPrint($pRoot) { if($pRoot == NULL) return []; $current = 0; $next = 1; $stack[0] = array(); $stack[1] = array(); $resultQueue = array(); array_push($stack[0], $pRoot); $i = 0; $result = array(); $result[0]= array(); while(!empty($stack[0]) || !empty($stack[1])){ $node = array_pop($stack[$current]); array_push($result[$i], $node->val); //var_dump($resultQueue);echo "
"; if($current == 0){ if($node->left != NULL) array_push($stack[$next], $node->left); if($node->right != NULL) array_push($stack[$next], $node->right); }else{ if($node->right != NULL) array_push($stack[$next], $node->right); if($node->left != NULL) array_push($stack[$next], $node->left); } if(empty($stack[$current])){ $current = 1-$current; $next = 1-$next; if(!empty($stack[0]) || !empty($stack[1])){ $i++; $result[$i] = array(); } } } return $result; }