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                #### 在C語言中,我們可以利用結構體和指針來實現各種數據結構.雖然在PHP中并沒有**結構體**和**指針**的概念,但是我們可以用**類**和**類的繼承**以及**變量的引用**來實現C語言結構體和指針同樣的效果.PHP中也有數組的概念,所以我們可以相對很方便的用它們來實現一些數據結構的構造. * 下面的代碼簡單實現了單鏈表的插入 ``` <?php class structNode { public $data; private $next; public function __construct($data) { $this->data = $data; } } class Link { private $header; public function __construct($headerData = 'header') { $this->header = new structNode($headerData); } public function insert($data,$pos) { $current = $this->header; $i = 0; while ( $i < $pos - 1) { $current = $current->next; $i++; } $tmp = $current->next; $newNode = structNode($data); $current->next = $newNode; $newNode = $tmp; return true; } } ``` #### 線性結構的相關內容放在了第一章,包括數組、鏈表、棧和隊列.其中重點講解的內容是鏈表、棧、隊列以及相關簡單應用,如**鏈表反轉**、**LRU算法**、**鏈表合并**等內容 #### 樹相關的內容在第二章,主要講解完全二叉樹、**二叉搜索樹**、**平衡二叉搜索樹**、B-Tree、**B+樹**、**堆**以及這些樹的相關應用
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