PHP添加计数器的实例讲解

我们在建立网站的时候，有些站长会有在自己首页上添加计数器的需求，我们今天就向大家具体讲讲counter.inc包含以下代码：

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><strong><font color="#006699"></font></strong></span><span>   </span></span></li>
<li class=""><span>/*   </span></li>
<li class="alt"><span>|| 一个简单的计数器   </span></li>
<li class=""><span>*/   </span></li>
<li class="alt"><span>function get_hitcount($counter_file)   </span></li>
<li class=""><span>{   </span></li>
<li class="alt"><span>/* 将计数器归零   </span></li>
<li class=""><span>这样如果计数器还未被使用，初始值将是1   </span></li>
<li class="alt"><span>你当然也可以把初始值设成20000来骗人咯   </span></li>
<li class=""><span>*/   </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">count</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">0</font></span><span>;   </span>
</li>
<li class=""><span>// 如果存放计数器文件已经存在，读取其中的内容   </span></li>
<li class="alt"><span>if ( file_exists($counter_file) )   </span></li>
<li class=""><span>{   </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">fp</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">fopen</font></span><span>($counter_file,"r");   </span>
</li>
<li class=""><span>// 我们只取了前20位，希望你的站点不要太受欢迎啊   </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">count</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">0</font></span><span>+fgets($fp,20);   </span>
</li>
<li class=""><span>// 由于函数fgets()返回字符串，我们可以通过加0的方法将其自动转换为整数   </span></li>
<li class="alt"><span>fclose($fp);   </span></li>
<li class=""><span>// 对文件操作完毕   </span></li>
<li class="alt"><span>}   </span></li>
<li class=""><span>// 增加一次计数值   </span></li>
<li class="alt"><span>$count++;   </span></li>
<li class=""><span>// 将新的计数值写入文件   </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">fp</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">fopen</font></span><span>($counter_file,"w");   </span>
</li>
<li class=""><span>fputs($fp,$count);   </span></li>
<li class="alt"><span>fclose($fp);   </span></li>
<li class=""><span># 返回计数值   </span></li>
<li class="alt"><span>return ($count);   </span></li>
<li class=""><span>}   </span></li>
<li class="alt">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>   </span>
</li>
</ol>

PHP添加计数器之后的一步就是我们需要更改front.php3文件以显示这个计数器：

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><strong><font color="#006699"></font></strong></span><span>   </span></span></li>
<li class="">
<span></span><span class="tag-name"><strong><font color="#006699">include</font></strong></span><span>("include/counter.inc");   </span>
</li>
<li class="alt"><span>// 我把计数值放在文件counter.txt中，读出并输出   </span></li>
<li class="">
<span>printf ("</span><strong><font color="#006699"><span class="tag"><span class="tag-name">CENTER</span><span class="tag">></span><span class="tag"><span class="tag-name">B</span><span class="tag">></span></span></span></font></strong><span>%06d</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">B</span><span class="tag">></span><span class="tag"></span><span class="tag-name">CENTER</span><span class="tag">></span></font></strong><span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">BR</span><span class="tag">></span></span></font></strong><span> n",   </span>
</li>
<li class="alt"><span>get_hitcount("counter.txt"));   </span></li>
<li class=""><span>include("include/footer.inc");   </span></li>
<li class="alt">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>   </span>
</li>
</ol>

以上全部代码就是PHP添加计数器的实现方式，希望对有需要的朋友有所帮助。