縫合css文件並縮小onthefly

現在我想包括一個minify函數如下。我怎樣才能合併這個？

function minify($css) { 
    $css = preg_replace('#\s+#', ' ', $css); 
    $css = preg_replace('#/\*.*?\*/#s', '', $css); 
    $css = str_replace('; ', ';', $css); 
    $css = str_replace(': ', ':', $css); 
    $css = str_replace(' {', '{', $css); 
    $css = str_replace('{ ', '{', $css); 
    $css = str_replace(', ', ',', $css); 
    $css = str_replace('} ', '}', $css); 
    $css = str_replace(';}', '}', $css); 

    return trim($css); 
}

代碼以進行拼接：

<?php 
$filename = $_GET['files']; 
// validate that $filename is set, contains only legal characters 
// and does not contain multiple dots (potential sign of trouble) 
if (!$filename || 
     !preg_match('/^([\.\-\_a-z0-9]*)$/i', $filename) || 
     preg_match('/([\.]{2,})/', $filename))  
    exit(); 

// we're sending CSS back to the browser 
header('Content-Type: text/css'); 

$files = explode('-', $filename, 15); 

// we're also writing CSS to a subdirectory "cache" 
// the filename will be the hyphen-delimited value 
// of $filename 
$cachefile = @fopen('cache/'. $filename, 'w'); 

// loop through, read each file, and stitch them together 
foreach ($files AS $file) { 
    $fcontents = null;  
    if ($cssfile = fopen($file, 'r')) {   
     $fcontents = fread($cssfile, filesize($file)) ."\n";   
     fclose($cssfile);  
    } 

    // if we read something, write it and send it to browser  
    if ($fcontents) { 
     fwrite($cachefile, $fcontents, strlen($fcontents)); 
     echo $fcontents;  
    }  
} 

// all done 
fclose($cachefile); 
?>

來源

2011-07-30 mark

順便說一句，你沒有正確地逃避文件名。列入黑名單是一個壞主意，您應該檢查您獲得的真實路徑是否指向緩存目錄中的某個位置。 http://cwe.mitre.org/top25/#CWE-22 – Clueless

你能幫我嗎？'因爲我不明白這一點。 – mark