php实现对css文件进行压缩和解压缩
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://HdhCmsTestw3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" > <html xmlns= "http://HdhCmsTestw3.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 (! empty empty ( $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>查看更多关于php实现对css文件进行压缩和解压缩 - php高级应用的详细内容...
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