php實(shí)現(xiàn)對css文件進(jìn)行壓縮和解壓縮

2024-05-04 21:47:51

字體：大中小

供稿：網(wǎng)友

下面用php實(shí)現(xiàn)了一個對css進(jìn)行壓縮和解壓縮的小程序,暫不適用于js的操作,通過這個案例可以學(xué)習(xí)php字符替換和正則替換的技術(shù).

將css代碼壓縮能夠減小文件的體積,從而減小了網(wǎng)絡(luò)傳輸量和帶寬占用,減小了服務(wù)器的處理的壓力.

代碼如下:

<!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()函數(shù)刪除轉(zhuǎn)義字符（反斜杠）

if(!emptyempty($string)){

if($_POST['method'] == '壓縮' ){

$string = css_compress($string);

}elseif($_POST['method'] == '解壓縮' ){

$string = css_decompress($string);

}

}else{

$string = '';

}

function css_compress($string){

//壓縮

$string = str_replace("/r/n","",$string); //首先去掉換行

$string = preg_replace("/(/s*/{/s*)/","{",$string);

$string = preg_replace("/(/s*/;/s*/}/s*)/","}",$string); //去掉反括號首位的空格和換行，和最后一個;

$string = preg_replace("/(/s*/;/s*)/",";",$string);

return $string;

}

function css_decompress($string){

//解壓

$string = css_compress($string); //為了效果更好，解壓前，先壓縮至最簡狀態(tài)

$string = str_replace("{","/r/n{/r/n/t",$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>請將css代碼粘貼到下面框中,然后選擇壓縮/解壓縮</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="壓縮" />

    <input type="submit" name="method" value="解壓縮" />

  </form>

  </div>

</body>

</html>