Example of CSS update class implemented in php_PHP tutorial

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/**css update class, update the version of the image in the css file

* Date: 2013-02-05

* Author: fdipzone

* Ver: 1.1

*

* Func:

* update();

*

* Ver: 1.1 Add search_child parameter to traverse subfolders

*/

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;

/**Initialization

* @param String $csstmpl_path css template path

* @param String $css_path css target path

* @param Array $replacetags The type of image to be replaced

* @param boolean $search_child Whether to traverse subfolders, default 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; 

    } 

  } 

  /**Update css file*/ 

  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); 

  } 

  /**Traverse folders

* @param String $path file path

*/ 

  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){  // 需要遍历子文件夹 

            $this->traversing($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); 

  } 

  /**Check file suffix*/ 

  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; 

  } 

  /**Replace template content and write csspath

* @param String $tmplfile template file

* @param String $dfile Target file

*/ 

  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))){  // 生成目标路径 

      mkdir(dirname($dfile), 0755, true); 

    } 

    file_put_contents($dfile, $css_content, true); 

  } 

  /**output*/ 

  private function response($content){ 

    echo $content."
"; 

  } 

} 

?>