Home >Backend Development >PHP Tutorial >PHP implements the sequential storage structure of linear tables
<code><span><span>class</span><span>SqList</span> {</span><span>public</span><span>$elem</span>; <span>public</span><span>$length</span>; <span>public</span><span>$size</span>; } <span><span>class</span><span>Linear</span> {</span><span>const</span> LIST_INIT_SIZE = <span>10</span>; <span>const</span> LIST_INCREMENT = <span>5</span>; <span>private</span><span>$list</span> = <span>null</span>; <span>/** * 构造一个空的线性表 */</span><span>public</span><span><span>function</span><span>initList</span><span>()</span> {</span><span>$this</span>-><span>list</span> = <span>new</span> SqList(); <span>$this</span>-><span>list</span>->elem = <span>array</span>(); <span>$this</span>-><span>list</span>->length = <span>0</span>; <span>$this</span>-><span>list</span>->size = <span>self</span>::LIST_INIT_SIZE; <span>return</span><span>true</span>; } <span>/** * 销毁线性表 */</span><span>public</span><span><span>function</span><span>destoryList</span><span>()</span> {</span><span>if</span> (is_object(<span>$this</span>-><span>list</span>)) { <span>$this</span>-><span>list</span> = <span>null</span>; } } <span>/** * 是否为空表 */</span><span>public</span><span><span>function</span><span>listEmpty</span><span>()</span> {</span><span>if</span> (is_object(<span>$this</span>-><span>list</span>)) { <span>return</span><span>$this</span>-><span>list</span>->length == <span>0</span> ? <span>true</span> : <span>false</span>; } } <span>/** * 返回元素个数 */</span><span>public</span><span><span>function</span><span>listLength</span><span>()</span> {</span><span>if</span> (is_object(<span>$this</span>-><span>list</span>)) { <span>return</span><span>$this</span>-><span>list</span>->length; } } <span>/** * 获取指定位置的元素 */</span><span>public</span><span><span>function</span><span>getElem</span><span>(<span>$i</span>)</span> {</span><span>if</span> (<span>$i</span> < <span>1</span> || <span>$i</span> > <span>$this</span>-><span>list</span>->length + <span>1</span>) { <span>return</span><span>false</span>; } <span>return</span><span>$this</span>-><span>list</span>->elem[<span>$i</span>-<span>1</span>]; } <span>/** * 在指定位置插入元素 */</span><span>public</span><span><span>function</span><span>listInsert</span><span>(<span>$i</span>, <span>$e</span>)</span> {</span><span>if</span> (<span>$i</span> < <span>1</span> || <span>$i</span> > <span>$this</span>-><span>list</span>->length + <span>1</span>) { <span>return</span><span>false</span>; } <span>if</span> (<span>$this</span>-><span>list</span>->length >= <span>$this</span>-><span>list</span>->size) { <span>$this</span>-><span>list</span>->size += <span>self</span>::LIST_INCREMENT; } <span>for</span> (<span>$j</span> = <span>$this</span>-><span>list</span>->length; <span>$j</span> >= <span>$i</span>; <span>$j</span>--) { <span>$this</span>-><span>list</span>->elem[<span>$j</span>] = <span>$this</span>-><span>list</span>->elem[<span>$j</span>-<span>1</span>]; } <span>$this</span>-><span>list</span>->elem[<span>$i</span>-<span>1</span>] = <span>$e</span>; <span>$this</span>-><span>list</span>->length++; } <span>/** * 删除指定位置数据元素 */</span><span>public</span><span><span>function</span><span>listDelete</span><span>(<span>$i</span>)</span> {</span><span>if</span> (<span>$i</span> < <span>1</span> || <span>$i</span> > <span>$this</span>-><span>list</span>->length) { <span>return</span><span>false</span>; } <span>$data</span> = <span>$this</span>-><span>list</span>->elem[<span>$i</span>-<span>1</span>]; <span>for</span> (<span>$j</span> = <span>$i</span> -<span>1</span>; <span>$j</span> < <span>$this</span>-><span>list</span>->length -<span>1</span>; <span>$j</span>++) { <span>$this</span>-><span>list</span>->elem[<span>$j</span>] = <span>$this</span>-><span>list</span>->elem[<span>$j</span>+<span>1</span>]; } <span>unset</span>(<span>$this</span>-><span>list</span>->elem[<span>$this</span>-><span>list</span>->length-<span>1</span>]); <span>$this</span>-><span>list</span>->length--; <span>return</span><span>$data</span>; } }</code>
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The above introduces the sequential storage structure of linear tables implemented in PHP, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.