PHP通过正则表达式下载图片到本地的实现代码

<?php 
/* 
author: ssh_kobe 
date: 20110602 
shortage: 如果网页中的图片路径不是绝对路径，就无法抓取 
*/ 
set_time_limit(0);//抓取不受时间限制 
$URL='http://pp.baidu.com/';//任意网址 
get_pic($URL); 
function get_pic($pic_url) { 
//获取图片二进制流 
$data=CurlGet($pic_url); 
/*利用正则表达式得到图片链接*/ 
$pattern_src = '/<[img|IMG].*?src=[\'|\"](.*?(?:[\.gif|\.jpg]))[\'|\"].*?[\/]?>/'; 
$num = preg_match_all($pattern_src, $data, $match_src); 
$arr_src=$match_src[1];//获得图片数组 
get_name($arr_src); 
echo "<br>finished!!!"; 
return 0; 
} 
/*得到图片类型，并将其保存到与该文件同一目录*/ 
function get_name($pic_arr) 
{ 
//图片类型 
$pattern_type = '/(/.(jpg|bmp|jpeg|gif|png))/'; 
foreach($pic_arr as $pic_item){//循环取出每幅图的地址 
$num = preg_match_all($pattern_type, $pic_item, $match_type); 
$pic_name = get_unique().$match_type[1][0];//改时微秒时间戳命名 
//以流的形式保存图片 
$write_fd = @fopen($pic_name,"wb"); 
@fwrite($write_fd, CurlGet($pic_item)); 
@fclose($write_fd); 
echo "[OK]..!"; 
} 
return 0; 
} 
//通过微秒时间获得唯一ID 
function get_unique(){ 
list($msec, $sec) = explode(" ",microtime()); 
return $sec.intval($msec*1000000); 
} 
//抓取网页内容 
function CurlGet($url){ 
$url=str_replace('&','&',$url); 
$curl = curl_init(); 
curl_setopt($curl, CURLOPT_URL, $url); 
curl_setopt($curl, CURLOPT_HEADER, false); 
//curl_setopt($curl, CURLOPT_REFERER,$url); 
curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; SeaPort/1.2; Windows NT 5.1; SV1; InfoPath.2)"); 
curl_setopt($curl, CURLOPT_COOKIEJAR, 'cookie.txt'); 
curl_setopt($curl, CURLOPT_COOKIEFILE, 'cookie.txt'); 
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); 
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 0); 
$values = curl_exec($curl); 
curl_close($curl); 
return $values; 
} 
?>