php實(shí)現(xiàn)的CSS更新類實(shí)例

    CSSUpdate.class.php類文件如下：
    <?php
    /** css 更新類,更新css文件內(nèi)圖片的版本
    * Date: 2013-02-05
    * Author: fdipzone
    * Ver: 1.1
    *
    * Func:
    * update();
    *
    * Ver: 1.1 增加search_child參數(shù),可遍歷子文件夾
    */
    class CSSUpdate{
    private $csstmpl_path = null;
    private $css_path = null;
    private $replacetags = array();
    private $search_child = false;
    private $convert_num = 0;
    private $is_ready = 0;
    /** 初始化
    * @param String $csstmpl_path css模版路徑
    * @param String $css_path css目標(biāo)路徑
    * @param Array $replacetags 需要替換的圖片類型
    * @param boolean $search_child 是否遍歷子文件夾,默認(rèn)false
    */
    public function __construct($csstmpl_path, $css_path, $replacetags=array(), $search_child=false){
    if(!is_dir($csstmpl_path) || !is_dir($css_path) || !$replacetags){
    $this->is_ready = 0;
    }else{
    $this->csstmpl_path = $csstmpl_path;
    $this->css_path = $css_path;
    $this->replacetags = $replacetags;
    $this->search_child = $search_child;
    $this->is_ready = 1;
    }
    }
    /** 更新css文件 */
    public function update(){
    if($this->is_ready==0){
    $this->response('csstmpl or csspath or replacetags error');
    return '';
    }
    $this->traversing($this->csstmpl_path);
    $this->response('covert num:'.$this->convert_num);
    }
    /** 遍歷文件夾
    * @param String $path 文件路徑
    */
    private function traversing($path){
    $handle = opendir($path);
    while(($file=readdir($handle))!==false){
    if($file!='..' && $file!='.'){
    $curfile = $path.'/'.$file;
    if(is_dir($curfile)){ // folder
    if($this->search_child){ // 需要遍歷子文件夾
    $this->traversing($curfile);
    }
    }elseif($this->checkExt($curfile)){ // css file
    $dfile = str_replace($this->csstmpl_path, $this->css_path, $curfile);
    $this->create($curfile, $dfile);
    $this->response($curfile.' convert to '.$dfile.' success');
    $this->convert_num ++;
    }
    }
    }
    closedir($handle);
    }
    /** 檢查文件后綴 */
    private function checkExt($file){
    $name = basename($file);
    $namefrag = explode('.', $name);
    if(count($namefrag)>=2){
    if(strtolower($namefrag[count($namefrag)-1])=='css'){ // css文件
    return true;
    }
    }
    return false;
    }
    /** 替換模版內(nèi)容,寫入csspath
    * @param String $tmplfile 模版文件
    * @param String $dfile 目標(biāo)文件
    */
    private function create($tmplfile, $dfile){
    $css_content = file_get_contents($tmplfile);
    foreach($this->replacetags as $tag){
    $css_content = str_replace($tag, $tag."?".date('YmdHis'), $css_content);
    }
    if(!is_dir(dirname($dfile))){ // 生成目標(biāo)路徑
    mkdir(dirname($dfile), 0755, true);
    }
    file_put_contents($dfile, $css_content, true);
    }
    /** 輸出 */
    private function response($content){
    echo $content."<br>";
    }
    }
    ?>
    demo示例程序如下:
    <?php
    require_once "CSSUpdate.class.php";
    define('ROOT_PATH', dirname(__FILE__));
    $css_path = ROOT_PATH.'/css';
    $csstmpl_path = ROOT_PATH.'/csstmpl';
    $replacetags = array('.png', '.jpg', '.gif');
    $cssobj = new CSSUpdate($csstmpl_path, $css_path, $replacetags);
    $cssobj->update();
    ?>