下面用php实现了一个对css进行压缩和解压缩的小程序,暂不适用于js的操作,通过这个案例可以学习php字符替换和正则替换的技术.
将css代码压缩能够减小文件的体积,从而减小了网络传输量和带宽占用,减小了服务器的处理的压力.
代码如下:
- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
- <html xmlns="http://www.w3.org/1999/xhtml">
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- </head>
- <?php
- $string = trim(stripslashes($_POST['code'])); //stripslashes()函数删除转义字符(反斜杠)
- if(!emptyempty($string)){
- if($_POST['method'] == '压缩' ){
- $string = css_compress($string);
- }elseif($_POST['method'] == '解压缩' ){
- $string = css_decompress($string);
- }
- }else{
- $string = '';
- }
- function css_compress($string){
- //压缩
- $string = str_replace("/r/n","",$string); //首先去掉换行
- $string = preg_replace("/(/s*/{/s*)/","{",$string);
- $string = preg_replace("/(/s*/;/s*/}/s*)/","}",$string); //去掉反括号首位的空格和换行,和最后一个;
- $string = preg_replace("/(/s*/;/s*)/",";",$string);
- return $string;
- }
- function css_decompress($string){
- //解压
- $string = css_compress($string); //为了效果更好,解压前,先压缩至最简状态
- $string = str_replace("{","/r/n{/r/n/t",$string);
- $string = str_replace("}","/r/n}/r/n/r/n",$string);
- $string = str_replace(";",";/r/n/t",$string);
- $string = str_replace("*/","*//r/n",$string);
- return $string;
- }
- ?>
- <body>
- <div style="width:800px;height:500px;text-align:center">
- <p><strong>请将css代码粘贴到下面框中,然后选择压缩/解压缩</strong></p>
- <form action="" method="post" name="css_code">
- <textarea style="width:90%;height:460px;padding:5px;" name="code"><?php echo $string; ?></textarea>
- <br />
- <input type="submit" name="method" value="压缩" />
- <input type="submit" name="method" value="解压缩" />
- </form>
- </div>
- </body>
- </html>
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