解释器： 解释器设计模式用于分析一个实体的关键元素，并且针对每个元素都提供自己的解释或相应的动作。
解释器设计模式最常用于PHP/HTML 模板系统。
<ol class="dp-c">
<li class="alt"><span><span><?php </span></span></span></li>
<li><span> <span class="keyword">class</span><span> User { </span></span></li>
<li class="alt"><span> <span class="keyword">protected</span><span> </span><span class="vars">$_username</span><span> = </span><span class="string">""</span><span>; </span></span></li>
<li><span> <span class="keyword">public</span><span> </span><span class="keyword">function</span><span> __construct(</span><span class="vars">$username</span><span>) { </span></span></li>
<li class="alt"><span> <span class="vars">$this</span><span>->_username = </span><span class="vars">$username</span><span>; </span></span></li>
<li><span> } </span></li>
<li class="alt"><span> <span class="keyword">public</span><span> </span><span class="keyword">function</span><span> getProfilePage() { </span></span></li>
<li><span> <span class="vars">$profile</span><span> = </span><span class="string">"<h2>I like Never Again ! </h2>"</span><span>; </span></span></li>
<li class="alt"><span> <span class="vars">$profile</span><span> .= </span><span class="string">"I love all of their songs. My favorite CD: <br>"</span><span>; </span></span></li>
<li><span> <span class="vars">$profile</span><span> .= </span><span class="string">"{{myCD.getTitle}}!!"</span><span>; </span></span></li>
<li class="alt"><span> </span></li>
<li><span> <span class="keyword">return</span><span> </span><span class="vars">$profile</span><span>; </span></span></li>
<li class="alt"><span> } </span></li>
<li><span> } </span></li>
<li class="alt"><span> <span class="keyword">class</span><span> userCD { </span></span></li>
<li><span> <span class="keyword">public</span><span> </span><span class="keyword">function</span><span> setUser(User </span><span class="vars">$user</span><span>) { </span></span></li>
<li class="alt"><span> <span class="vars">$this</span><span>->_user = </span><span class="vars">$user</span><span>; </span></span></li>
<li><span> } </span></li>
<li class="alt"><span> <span class="keyword">public</span><span> </span><span class="keyword">function</span><span> getTitle() { </span></span></li>
<li><span> <span class="vars">$title</span><span> = </span><span class="string">"Waste of a Rib"</span><span>; </span></span></li>
<li class="alt"><span> <span class="keyword">return</span><span> </span><span class="vars">$title</span><span>; </span></span></li>
<li><span> } </span></li>
<li class="alt"><span> } </span></li>
<li><span> <span class="keyword">class</span><span> userCDInterpreter { </span></span></li>
<li class="alt"><span> </span></li>
<li><span> <span class="keyword">protected</span><span> </span><span class="vars">$_user</span><span> = NULL; </span></span></li>
<li class="alt"><span> </span></li>
<li><span> <span class="keyword">public</span><span> </span><span class="keyword">function</span><span> setUser(User </span><span class="vars">$user</span><span>) { </span></span></li>
<li class="alt"><span> <span class="vars">$this</span><span>->_user = </span><span class="vars">$user</span><span>; </span></span></li>
<li><span> } </span></li>
<li class="alt"><span> </span></li>
<li><span> <span class="keyword">public</span><span> </span><span class="keyword">function</span><span> getInterpreted() { </span></span></li>
<li class="alt"><span> <span class="vars">$profile</span><span> = </span><span class="vars">$this</span><span>->_user->getProfilePage(); </span></span></li>
<li><span> </span></li>
<li class="alt"><span> <span class="keyword">if</span><span> (preg_match_all(</span><span class="string">'/\{\{myCD\.(.*?)\}\}/'</span><span>, </span><span class="vars">$profile</span><span>, </span><span class="vars">$triggers</span><span>, PREG_SET_ORDER)) { </span></span></li>
<li><span> <span class="vars">$replacements</span><span> = </span><span class="keyword">array</span><span>(); </span></span></li>
<li class="alt"><span> </span></li>
<li><span> <span class="keyword">foreach</span><span> (</span><span class="vars">$triggers</span><span> </span><span class="keyword">as</span><span> </span><span class="vars">$trigger</span><span>) { </span></span></li>
<li class="alt"><span> <span class="vars">$replacements</span><span>[] = </span><span class="vars">$trigger</span><span>[1]; </span></span></li>
<li><span> } </span></li>
<li class="alt"><span> </span></li>
<li><span> <span class="vars">$replacements</span><span> = </span><span class="func">array_unique</span><span>(</span><span class="vars">$replacements</span><span>); </span></span></li>
<li class="alt"><span> </span></li>
<li><span> <span class="vars">$myCD</span><span> = </span><span class="keyword">new</span><span> userCD(); </span></span></li>
<li class="alt"><span> <span class="vars">$myCD</span><span>->setUser(</span><span class="vars">$this</span><span>->_user); </span></span></li>
<li><span> </span></li>
<li class="alt"><span> <span class="keyword">foreach</span><span> (</span><span class="vars">$replacements</span><span> </span><span class="keyword">as</span><span> </span><span class="vars">$replacement</span><span>) { </span></span></li>
<li><span> <span class="vars">$profile</span><span> = </span><span class="func">str_replace</span><span>(</span><span class="string">"{{myCD.{$replacement}}}"</span><span>, call_user_func(</span><span class="keyword">array</span><span>(</span><span class="vars">$myCD</span><span>, </span><span class="vars">$replacement</span><span>)), </span><span class="vars">$profile</span><span>); </span></span></li>
<li class="alt"><span> } </span></li>
<li><span> } </span></li>
<li class="alt"><span> </span></li>
<li><span> <span class="keyword">return</span><span> </span><span class="vars">$profile</span><span>; </span></span></li>
<li class="alt"><span> } </span></li>
<li><span> </span></li>
<li class="alt"><span> } </span></li>
<li><span> <span class="vars">$username</span><span> = </span><span class="string">"aaron"</span><span>; </span></span></li>
<li class="alt"><span> <span class="vars">$user</span><span> = </span><span class="keyword">new</span><span> User(</span><span class="vars">$username</span><span>); </span></span></li>
<li><span> <span class="vars">$interpreter</span><span> = </span><span class="keyword">new</span><span> userCDInterpreter(); </span></span></li>
<li class="alt"><span> <span class="vars">$interpreter</span><span>->setUser(</span><span class="vars">$user</span><span>); </span></span></li>
<li><span> </span></li>
<li class="alt"><span> print <span class="string">"<h1>{$username}'s Profile</h1>"</span><span>; </span></span></li>
<li><span> print <span class="vars">$interpreter</span><span>->getInterpreted(); </span></span></li>
<li class="alt"><span>?> </span></li>
</ol>数据库脚本请参照：http://www.cxybl.com/html/wlbc/Php/2011_1126_9458.html
