How to use PHP to create a dynamic counter_PHP tutorial

我们在创建网站的时候，通常都会有在网页中添加计数器的功能，今天在这篇文章中我们将为大家具体介绍PHP制作动态计数器的相关功能。

的功能非常强大，你可以利用它做几乎任何事。不需要复杂的变量和代码，你就可以非常迅速地做出漂亮的计数器来。下面，就让我们一步一步的来做。

其实，PHP制作动态计数器的原理大家都知道，首先，确定一个记录文件，例如counter.txt或counter.log，每一次访问这个页面，就对这个文件加1，然后把结果显示出来。因此，我们的PHP代码开始应该是这样的：

<ol class="dp-xml">
<li class="alt"><span><span class="tag">< ?</span><span class="tag-name">PHP</span><span> </span></span></li><li><span>$</span><span class="attribute">countfile</span><span> = </span><span class="attribute-value">"js/counter.inf"</span><span>;  </span></li><li class="alt"><span>//定义计数器写入的文件是当前目录下JS目录中<br />//counter.inf，然后我们应当测试该文件能否打开  </span></li><li><span>if (($</span><span class="attribute">fp</span><span> = </span><span class="attribute-value">fopen</span><span>($countfile, "r+")) == false) <br />{ //用读写模式打开文件，若不能打开就退出  </span></li><li class="alt"><span>printf ("Open file %s failed!",$countfile);  </span></li><li><span>exit;  </span></li><li class="alt"><span>}  </span></li><li><span>else  </span></li><li class="alt"><span>{  </span></li><li><span>//如果文件能够正常打开，就读入文件中的数据，假设是1  </span></li><li class="alt"><span>$</span><span class="attribute">count</span><span> = </span><span class="attribute-value">fread</span><span> ($fp,10);  </span></li><li><span>//读取10位数据  </span></li><li class="alt"><span>$</span><span class="attribute">count</span><span> = $count + 1;  </span></li><li><span>//count ++  </span></li><li class="alt"><span>fclose ($fp);  </span></li><li><span>//关闭当前文件  </span></li><li class="alt"><span>$</span><span class="attribute">fp</span><span> = </span><span class="attribute-value">fopen</span><span>($countfile, "w+")  </span></li><li><span>//以覆盖模式打开文件  </span></li><li class="alt"><span>fwrite ($fp,$count);  </span></li><li><span>//写入加1后的新数据  </span></li><li class="alt"><span>fclose ($fp);  </span></li><li><span>//并关闭文件  </span></li><li class="alt"><span>} </span></li></ol>

这时，整个PHP制作动态计数器的工作就完成了，如果只是简单的文字计数的话，在这里就可以输出变量$count的值。下面是将$count转换为图片模式的代码：

<ol class="dp-xml"><li class="alt"><span><span>$</span><span class="attribute">fp</span><span> = </span><span class="attribute-value">fopen</span><span> ($countfile, "r"); <br />//以只读模式打开文件  </span></span></li><li><span>$</span><span class="attribute">array_count</span><span> = </span><span class="attribute-value">1</span><span>; //定义一个表<br />示数组元素位置的变量，下面要用  </span></li><li class="alt"><span>while (! feof($fp)) {  </span></li><li><span>$</span><span class="attribute">current_number</span><span> = </span><span class="attribute-value">fgetc</span><span>($fp);  </span></li><li class="alt"><span>$counter_array[$array_count] = $current_number;  </span></li><li><span>$</span><span class="attribute">array_elements</span><span> = </span><span class="attribute-value">count</span><span> ($counter_array);  </span></li><li class="alt"><span>$</span><span class="attribute">array_count</span><span> = $array_count + 1;  </span></li><li><span>}  </span></li></ol>

上面这个while循环的作用是把每一位数分离出来。它从counter.inf中由左到右逐位读取数值，并依次写入一个叫counter_array的数组中，这个数组的索引是从1开始的($array_count)。如果现在counter.inf中的数字是158，那么数组$counter_array[]就像这样：$counter_array[1] = 1、$counter_array[2] = 5、$counter_array[3] = 8。有了上面这些工作，我们就可以方便地显示不同的数字图片了，PHP制作动态计数器显示代码如下：

<ol class="dp-xml"><li class="alt"><span><span>echo ("</span><span class="tag"><</span><span class="tag-name">table</span><span> </span><span class="attribute">border</span><span>=($%$43%^<br />#ASD#2@$#f$%^)0($%$43%^#ASD#2@$#f$%^)<br /> </span><span class="attribute">height</span><span>=($%$43%^#ASD#2@$#f$%^)5($%$43<br />%^#ASD#2@$#f$%^) </span><span class="attribute">align</span><span>=($%$43%^#ASD#2@$<br />#f$%^)center($%$43%^#ASD#2@$#f$%^)</span><span class="tag">></span><span class="tag"><</span><span class="tag-name">tr</span><span class="tag">></span></span></li>
<li class="alt"><span><span class="tag"><</span><span class="tag-name">td</span><span> </span><span class="attribute">bgcolor</span><span>=($%$43%^#ASD#2@$#f$%^)#<br />bab389($%$43%^#ASD#2@$#f$%^) </span></span></li><li class="alt"><span><span class="attribute">align</span><span>=($%$43%^#ASD#2@$#f$%^)center($%$43%^#ASD#2@$#f$%^)</span></span></li><li class="alt"><span><span class="tag">></span><span>欢迎您，第");  </span></span></li>
<li>
<span>for ($</span><span class="attribute">array_id</span><span> = </span><span class="attribute-value">1</span><span>;$array_id </span><span class="tag"><</span><span> $array_elements; ++ $array_id) {  </span></li><li class="alt"><span>echo ("</span><span class="tag"><</span><span class="tag-name">img</span><span> </span><span class="attribute">src</span><span>=</span><span class="attribute-value">http</span><span>://www.asp315.com<br />/news/2/($%$43%^#ASD#2@$#f$%^)images<br />//counter//$counter_array[$array_id].gif($%$43%^#ASD#2@$#f$%^)<br /> </span><span class="attribute">align</span><span>=</span><span class="attribute-value">absmiddle</span><span class="tag">></span><span>");  </span>
</li>
<li><span>}  </span></li>
<li class="alt">
<span>echo ("位客人</span><span class="tag"></</span><span class="tag-name">td</span><span class="tag">></span><span class="tag"></</span><span class="tag-name">tr</span><span class="tag">></span><span class="tag"></</span><span class="tag-name">table</span><span class="tag">></span><span>");  </span>
</li>
<li><span>}  </span></li>
</ol>

上面的PHP制作动态计数器代码很简单，就是画一个表格，并依次在表格中显示所需的图片。在imagescounter目录下有0.gif至9.gif十张图片，for循环遍历数组，从高位到低位给出每一位数相应的图片，直到数组的尾部。这样，一个完整的计数器就完成了。

http://www.bkjia.com/PHPjc/446242.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/446242.htmlTechArticle我们在创建网站的时候，通常都会有在网页中添加计数器的功能，今天在这篇文章中我们将为大家具体介绍PHP制作动态计数器的相关功能。...