赞片CMS下载系统常用标签 函数标签使用
函数标签除程序的函数外还包括PHP函数的标签同样支持；全站调用
函数使用方法：
函数名(参数1,参数2,参数3)
在模版中可以两种方法使用函数
<pre><code class="ಠhighlight-container"><span class="token punctuation"></span></code><code class="ಠhighlight-container">第一种直接使用
<span class="token punctuation"></span></code><code class="ಠhighlight-container"><span class="token punctuation">{</span><span class="token punctuation">:</span>函数名<span class="token punctuation">(</span>参数<font color="Red"><span class="token number">1</span></font><span class="token punctuation">,</span>参数<font color="Red"><span class="token number">2</span></font><span class="token punctuation">,</span>参数<font color="Red"><span class="token number">3</span></font><span class="token punctuation">)</span><span class="token punctuation">}</span></code><code class="ಠhighlight-container"><span class="token punctuation"></span><span class="token punctuation"></span>
第二种在变量中使用
<span class="token punctuation">{</span>$变量<span class="token operator">|</span>函数名<span class="token operator">=</span>参数<font color="Red"><span class="token number">2</span></font><span class="token punctuation">,</span>参数<font color="Red"><span class="token number">3</span></font><span class="token punctuation">}</span></code></pre>
PHP函数标签使用请参考TP文档
http://www.kancloud.cn/manual/thinkphp5/125005
函数使用方法
我们往往需要对模板输出变量使用函数，可以使用：
<pre><code class="ಠhighlight-container"><span class="token punctuation">{</span>$data<span class="token punctuation">.</span>name<span class="token operator">|</span>md5<span class="token punctuation">}</span>
</code></pre>
<p>编译后的结果是：</p>
<pre><code class="ಠhighlight-container"><span class="token operator"><</span><span class="token operator">?</span>php echo <span class="token punctuation">(</span><font color="Red"><span class="token function">md5</span></font><span class="token punctuation">(</span>$data<span class="token punctuation">[</span><span class="token string">'<font color="Green">name</font>'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token operator">?</span><span class="token operator">></span>
</code></pre>
<p>如果函数有多个参数需要调用，则使用：</p>
<pre><code class="ಠhighlight-container"><span class="token punctuation">{</span>$create_time<span class="token operator">|</span>date<span class="token operator">=</span><span class="token string">"<font color="Green">y-m-d</font>"</span><span class="token punctuation">,</span>###<span class="token punctuation">}</span>
</code></pre>
表示date函数传入两个参数，每个参数用逗号分割，这里第一个参数是y-m-d，第二个参数是前面要输出的create_time变量，因为该变量是第二个参数，因此需要用###标识变量位置，编译后的结果是：
<pre><code class="ಠhighlight-container"><span class="token operator"><</span><span class="token operator">?</span>php echo <span class="token punctuation">(</span><font color="Red"><span class="token function">date</span></font><span class="token punctuation">(</span><span class="token string">"<font color="Green">y-m-d</font>"</span><span class="token punctuation">,</span>$create_time<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token operator">?</span><span class="token operator">></span>
</code></pre>
<p>如果前面输出的变量在后面定义的函数的第一个参数，则可以直接使用：</p>
<pre><code class="ಠhighlight-container"><span class="token punctuation">{</span>$data<span class="token punctuation">.</span>name<span class="token operator">|</span>substr<span class="token operator">=</span><font color="Red"><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">3</span></font><span class="token punctuation">}</span>
</code></pre>
<p>表示输出</p>
<pre><code class="ಠhighlight-container"><span class="token operator"><</span><span class="token operator">?</span>php echo <span class="token punctuation">(</span><font color="DarkOrange"><span class="token function">substr</span></font><span class="token punctuation">(</span>$data<span class="token punctuation">[</span><span class="token string">'<font color="Green">name</font>'</span><span class="token punctuation">]</span><span class="token punctuation">,</span><font color="Red"><span class="token number">0</span></font><span class="token punctuation">,</span><font color="Red"><span class="token number">3</span></font><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token operator">?</span><span class="token operator">></span>
</code></pre>
<p>虽然也可以使用：</p>
<pre><code class="ಠhighlight-container"><span class="token punctuation">{</span>$data<span class="token punctuation">.</span>name<span class="token operator">|</span>substr<span class="token operator">=</span>###<span class="token punctuation">,</span><font color="Red"><span class="token number">0</span></font><span class="token punctuation">,</span><font color="Red"><span class="token number">3</span></font><span class="token punctuation">}</span>
</code></pre>
<p>但完全没用这个必要。</p>
<p>还可以支持多个函数过滤，多个函数之间用“|”分割即可，例如：</p>
<pre><code class="ಠhighlight-container"><span class="token punctuation">{</span>$name<span class="token operator">|</span>md5<span class="token operator">|</span>strtoupper<span class="token operator">|</span>substr<span class="token operator">=</span><font color="Red"><span class="token number">0</span></font><span class="token punctuation">,</span><font color="Red"><span class="token number">3</span></font><span class="token punctuation">}</span>
</code></pre>
<p>编译后的结果是：</p>
<pre><code class="ಠhighlight-container"><span class="token operator"><</span><span class="token operator">?</span>php echo <span class="token punctuation">(</span><font color="DarkOrange"><span class="token function">substr</span></font><span class="token punctuation">(</span><font color="DarkOrange"><span class="token function">strtoupper</span></font><span class="token punctuation">(</span><font color="DarkOrange"><span class="token function">md5</span></font><span class="token punctuation">(</span>$name<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span><font color="Red"><span class="token number">0</span></font><span class="token punctuation">,</span><font color="Red"><span class="token number">3</span></font><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token operator">?</span><span class="token operator">></span>
</code></pre>
<p>函数会按照从左到右的顺序依次调用。</p>
<p>如果你觉得这样写起来比较麻烦，也可以直接这样写：</p>
<pre><code class="ಠhighlight-container"><span class="token punctuation">{</span><span class="token punctuation">:</span><font color="DarkOrange"><span class="token function">substr</span></font><span class="token punctuation">(</span><font color="DarkOrange"><span class="token function">strtoupper</span></font><span class="token punctuation">(</span><font color="DarkOrange"><span class="token function">md5</span></font><span class="token punctuation">(</span>$name<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span><font color="Red"><span class="token number">0</span></font><span class="token punctuation">,</span><font color="Red"><span class="token number">3</span></font><span class="token punctuation">)</span><span class="token punctuation">}</span>
</code></pre>
变量输出使用的函数可以支持内置的PHP函数或者用户自定义函数，甚至是静态方法。
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