php实现对css文件进行压缩和解压缩

时间：2015-01-23 来源：西部数据作者：西部数据

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>