<?php
 header("Content-Type: text/html; charset=utf-8");
    error_reporting(E_ERROR|E_WARNING);
 //全局配置
 $fromFile = "aaa.css";  //要抓取的文件
 $savePath = "ttttttttt";  //保存路径
 $fromDomain = "http://www.xxx.com/"; //要抓取的域名
 //读取css样式并且分离出所有image的url
 $str = file_get_contents($fromFile);
 $strArr = explode("url(",$str); 
 $i = 0;
 foreach($strArr as $val){
 $val1 = explode(")",$val);
 if(strpos($val1[0],'jpg')||strpos($val1[0],'png')||strpos($val1[0],'gif'))
 $imgUrl[$i++] = $val1[0];
 }
    //PS:上面可以用正则的，但是我觉得这样也不错
 //开始抓取
 foreach($imgUrl as $url){
 if($url=="") continue;
 $filename = $savePath.$url;
 $url = $fromDomain.$url;
 getImage($url,$filename);
 }
 function getImage($url,$filename){
 ob_start();
 $context = stream_context_create(
       array (
     'http' => array (
      'follow_location' => false // don't follow redirects
      )
     )
 );
 //请确保php.ini中的fopen wrappers已经激活
 readfile( $url,false,$context);
 $img = ob_get_contents();
        ob_end_clean();
 $fp2 = @fopen($filename,"a");
 fwrite($fp2,$img);
 fclose($fp2);
 echo $filename." ok √<br/>";
 }
?>

/* 
*功能：php完美实现下载远程图片保存到本地 
*参数：文件url,保存文件目录,保存文件名称，使用的下载方式 
*当保存文件名称为空时则使用远程文件原来的名称 
*/ 
function getImage($url,$save_dir='',$filename='',$type=0){ 
  if(trim($url)==''){ 
    return array('file_name'=>'','save_path'=>'','error'=>1); 
  } 
  if(trim($save_dir)==''){ 
    $save_dir='./'; 
  } 
  if(trim($filename)==''){//保存文件名 
    $ext=strrchr($url,'.'); 
    if($ext!='.gif'&&$ext!='.jpg'){ 
      return array('file_name'=>'','save_path'=>'','error'=>3); 
    } 
    $filename=time().$ext; 
  } 
  if(0!==strrpos($save_dir,'/')){ 
    $save_dir.='/'; 
  } 
  //创建保存目录 
  if(!file_exists($save_dir)&&!mkdir($save_dir,0777,true)){ 
    return array('file_name'=>'','save_path'=>'','error'=>5); 
  } 
  //获取远程文件所采用的方法 
  if($type){ 
    $ch=curl_init(); 
    $timeout=5; 
    curl_setopt($ch,CURLOPT_URL,$url); 
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); 
    curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout); 
    $img=curl_exec($ch); 
    curl_close($ch); 
  }else{ 
    ob_start(); 
    readfile($url); 
    $img=ob_get_contents(); 
    ob_end_clean(); 
  } 
  //$size=strlen($img); 
  //文件大小 
  $fp2=@fopen($save_dir.$filename,'a'); 
  fwrite($fp2,$img); 
  fclose($fp2); 
  unset($img,$url); 
  return array('file_name'=>$filename,'save_path'=>$save_dir.$filename,'error'=>0); 
}