How to get the image address in the CSS file and download it locally in php_PHP tutorial

/**
* Get the image address in CSS and save it locally
*/
class getInCssImage
{ 
/**
* Save the picture
* @param $cssUrl css url address
* @param $dir Directory to save pictures
* @return void
                     */
          static public function saveImage($cssUrl, $dir)
                                                                                                    $content = file_get_contents($cssUrl);                                                       $patterns = '/images(.*).(jpg|gif|png)/'; //Regular needs to be transformed according to different addresses
                 preg_match_all($patterns, $content, $matches);
                 $imagesUrls = $matches[0];
If (!is_dir($dir))
                       mkdir(dirname(__FILE__). '/'. $dir, 0777);
               foreach($imagesUrls as $image)
                                                                                           ob_start();
                     $imageUrl = "http://www.xxxx.com/".$image; //Fill in the address you want to crawl with this address
                     read file($imageUrl);
$img = ob_get_contents();
                        ob_end_clean();
                     $size = strlen($img);
                          $localImage = $dir. strchr($image, '/'); //Save the local image address
                       $fp = fopen($localImage, 'a');
                            fwrite($fp, $img);
                                                                                                                                                                                                                                                                  through fclose($fp);
                                                                                                                                             }
$content = getInCssImage::saveImage('/css/css.css', 'image');



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