PHP超长文本的分页显示

PHP实现超长文本的分页显示，如下代码：

<ol class="dp-xml">
<li class="alt"><span><span class="tag"></span><span class="tag-name">php</span><span>  </span></span></li>
<li><span>session_start(); </span></li>
<li class="alt"><span> if(isset($_REQUEST['page'])) </span></li>
<li><span> { </span></li>
<li class="alt"><span>   $<span class="attribute">page</span><span> = </span><span class="attribute-value">intval</span><span>($_GET['page']); </span></span></li>
<li><span> } </span></li>
<li class="alt"><span> else </span></li>
<li><span> { </span></li>
<li class="alt"><span>   $<span class="attribute">page</span><span> = </span><span class="attribute-value">1</span><span>; </span></span></li>
<li><span> } </span></li>
<li class="alt"><span> <span class="tag">?></span><span> </span></span></li>
<li><span><span class="tag"><span class="tag-name">html</span><span class="tag">></span><span> </span></span></span></li>
<li class="alt"><span><span class="tag"><span class="tag-name">head</span><span class="tag">></span><span> </span></span></span></li>
<li><span><span class="tag"><span class="tag-name">meta</span><span> </span><span class="attribute">http-equiv</span><span>=</span><span class="attribute-value">"Content-Type"</span><span> </span><span class="attribute">content</span><span>=</span><span class="attribute-value">"text/html; charset=gb2312"</span><span> </span><span class="tag">/></span><span> </span></span></span></li>
<li class="alt"><span><span class="tag"><span class="tag-name">title</span><span class="tag">></span><span>超长文本的分页显示 - www.cxybl.com</span><span class="tag"></span><span class="tag-name">title</span><span class="tag">></span><span> </span></span></span></li>
<li><span><span class="tag"><span class="tag-name">style</span><span> </span><span class="attribute">type</span><span>=</span><span class="attribute-value">"text/css"</span><span class="tag">></span><span> </span></span></span></li>
<li class="alt"><span></span></li>
</ol>