YUI Compressor在线压缩（Javascript/Css）

demo地址：http://www.atool.org/yui.php

支持YUI Compressor的所有功能和指令，支持Javascript/Css的在线压缩、混淆和合并文件，从而减少网站网络请求和连接数量。
支持多文件的压缩合并，但是请注意合并的文件属于同一种类型，js或css，不可混淆使用。

1. [代码][PHP]代码    

function compress()
    {
        
        // read the input
        foreach ($this->files as $file) {
    		$this->string .= file_get_contents($file) or die("Cannot read from uploaded file");        
        }
    	
        // create single file from all input
        $input_hash = sha1($this->string);
        $file = $this->TEMP_FILES_DIR . '/' . $input_hash . '.txt';
        $fh = fopen($file, 'w') or die("Can't create new file");
        fwrite($fh, $this->string);
        fclose($fh);
    	
    	// start with basic command
        $cmd = "java -Xmx32m -jar " . escapeshellarg($this->JAR_PATH) . ' ' . escapeshellarg($file) . " --charset UTF-8";
    
        // set the file type
    	$cmd .= " --type " . (strtolower($this->options['type']) == "css" ? "css" : "js");
    	
    	// and add options as needed
    	if ($this->options['linebreak'] && intval($this->options['linebreak']) > 0) {
            $cmd .= ' --line-break ' . intval($this->options['linebreak']);
    	}
    	if ($this->options['verbose']) {
    	   $cmd .= " -v";
        }
            
		if ($this->options['nomunge']) {
			$cmd .= ' --nomunge';
		}
		
		if ($this->options['semi']) {
			$cmd .= ' --preserve-semi';
		}
		
		if ($this->options['nooptimize']) {
			$cmd .= ' --disable-optimizations';
		}
    
        // execute the command
    	exec($cmd . ' 2>&1', $raw_output);
    	
    	// add line breaks to show errors in an intelligible manner
        $flattened_output = implode("\n", $raw_output);
    	
    	// clean up (remove temp file)
    	unlink($file);
    	
    	// return compressed output
    	return $flattened_output;
    }