feat: Add PHP Codes for utils

codes/php/utils/ListNode.php

@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * File: ListNode.php
+ * Created Time: 2024-05-19
+ * Author: DoWake (admin@mengxing.cc)
+ */
+
+/* 链表节点 */
+class ListNode
+{
+  public $val; // 节点值
+  public $next; // 指向下一个节点的引用
+
+  /* 构造方法 */
+  public function __construct($val = 0, $next = null)
+  {
+    $this->val = $val;
+    $this->next = $next;
+  }
+
+  /* 将列表反序列化为链表 */
+  public static function arrToLinkedList($arr)
+  {
+    $dum = new ListNode(0);
+    $head = $dum;
+    foreach ($arr as $val) {
+      $head->next = new ListNode($val);
+      $head = $head->next;
+    }
+    return $dum->next;
+  }
+}

codes/php/utils/PrintUtil.php

@@ -0,0 +1,111 @@
+<?php
+
+/**
+ * File: PrintUtil.php
+ * Created Time: 2024-05-19
+ * Author: DoWake (admin@mengxing.cc)
+ */
+
+require_once 'TreeNode.php';
+
+class Trunk
+{
+  public $prev;
+  public $str;
+
+  public function __construct($prev, $str)
+  {
+    $this->prev = $prev;
+    $this->str = $str;
+  }
+}
+
+class PrintUtil
+{
+
+  /* 打印矩阵（Array） */
+  public static function printMatrix($matrix)
+  {
+    echo '[' . PHP_EOL;
+    foreach ($matrix as $row) {
+      echo '  [' . implode(', ', $row) . '],' . PHP_EOL;
+    }
+    echo ']' . PHP_EOL;
+  }
+
+  /* 打印链表 */
+  public static function printLinkedList($head)
+  {
+    $list = [];
+    while ($head !== null) {
+      $list[] = $head->val;
+      $head = $head->next;
+    }
+    echo join(' -> ', $list) . PHP_EOL;
+  }
+
+  /**
+   * 打印二叉树
+   * This tree printer is borrowed from TECHIE DELIGHT
+   * https://www.techiedelight.com/c-program-print-binary-tree/
+   */
+  public static function printTree($root, $prev = null, $isRight = false)
+  {
+    if ($root === null) {
+      return;
+    }
+
+    $prev_str = '    ';
+    $trunk = new Trunk($prev, $prev_str);
+
+    self::printTree($root->right, $trunk, true);
+
+    if ($prev === null) {
+      $trunk->str = '———';
+    } else if ($isRight) {
+      $trunk->str = '/———';
+      $prev_str = '   |';
+    } else {
+      $trunk->str = '\\———';
+      $prev->str = $prev_str;
+    }
+
+    self::showTrunks($trunk);
+    echo ' ' . $root->val . PHP_EOL;
+
+    if ($prev !== null) {
+      $prev->str = $prev_str;
+    }
+    $trunk->str = '   |';
+
+    self::printTree($root->left, $trunk, false);
+  }
+
+  public static function showTrunks($p)
+  {
+    if ($p === null) {
+      return;
+    }
+
+    self::showTrunks($p->prev);
+    echo $p->str;
+  }
+
+  /* 打印哈希表 */
+  public static function printHashMap($map)
+  {
+    foreach ($map as $key => $value) {
+      echo $key . ' -> ' . $value . PHP_EOL;
+    }
+  }
+
+  /* 打印堆（优先队列） */
+  public static function printHeap($queue)
+  {
+    echo '堆的数组表示：';
+    echo '[' . join(', ', $queue) . ']' . PHP_EOL;
+    echo '堆的树状表示：' . PHP_EOL;
+    $root = TreeNode::listToTree($queue);
+    self::printTree($root);
+  }
+}

codes/php/utils/TreeNode.php

@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * File: TreeNode.php
+ * Created Time: 2024-05-19
+ * Author: DoWake (admin@mengxing.cc)
+ */
+
+/* 二叉树节点类 */
+class TreeNode
+{
+  public $val; // 节点值
+  public $height; // 节点高度
+  public $left; // 左子节点引用
+  public $right; // 右子节点引用
+
+  /* 构造方法 */
+  public function __construct($val = 0, $left = null, $right = null, $height = 0)
+  {
+    $this->val = $val;
+    $this->left = $left;
+    $this->right = $right;
+    $this->height = $height;
+  }
+
+  /* 将列表反序列化为二叉树：递归 */
+  private static function listToTreeDFS($arr, $i = 0)
+  {
+    if ($i < 0 || $i >= count($arr) || $arr[$i] === null) {
+      return null;
+    }
+    $root = new TreeNode($arr[$i]);
+    $root->left = self::listToTreeDFS($arr, 2 * $i + 1);
+    $root->right = self::listToTreeDFS($arr, 2 * $i + 2);
+    return $root;
+  }
+
+  /* 将列表反序列化为二叉树 */
+  public static function listToTree($arr)
+  {
+    return self::listToTreeDFS($arr, 0);
+  }
+
+  /* 将二叉树序列化为列表：递归 */
+  private static function treeToListDFS($root, $i, &$res)
+  {
+    if ($root === null) {
+      return;
+    }
+    $res[$i] = $root->val;
+    self::treeToListDFS($root->left, 2 * $i + 1, $res);
+    self::treeToListDFS($root->right, 2 * $i + 2, $res);
+  }
+
+  /* 将二叉树序列化为列表 */
+  public static function treeToList($root)
+  {
+    $res = [];
+    self::treeToListDFS($root, 0, $res);
+    return $res;
+  }
+}

codes/php/utils/Vertex.php

@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * File: Vertex.php
+ * Created Time: 2024-05-19
+ * Author: DoWake (admin@mengxing.cc)
+ */
+
+/* 顶点类 */
+class Vertex
+{
+  public $val;
+
+  /* 构造方法 */
+  public function __construct($val)
+  {
+    $this->val = $val;
+  }
+
+  /* 输入值列表 vals ，返回顶点列表 vets */
+  public static function valsToVets($vals)
+  {
+    $vets = [];
+    foreach ($vals as $val) {
+      $vets[] = new Vertex($val);
+    }
+    return $vets;
+  }
+
+  /* 输入顶点列表 vets ，返回值列表 vals */
+  public static function vetsToVals($vets)
+  {
+    $vals = [];
+    foreach ($vets as $vet) {
+      $vals[] = $vet->val;
+    }
+    return $vals;
+  }
+}