想获取网站中的所有超链接，使用的是php snoopy类
$sourceURL = $url;
$snoopy->fetchlinks($sourceURL);
$content = $snoopy->results;获取的结果如下：
array (size=627)
0 => string 'http://www.alibaba.com/https://login.alibaba.com/' (length=49)
1 => string 'http://sh.vip.alibaba.com?tracelog=nav_ma' (length=41)
2 => string 'http://message.alibaba.com/feedback/default.htm?routeto=inbox&tracelog=nav_ma_mc' (length=80)
3 => string 'http://www.alibaba.com//hz-favorite.alibaba.com/favorite/favorite_home.htm?tracelog=nav_ma_fav' (length=94)
4 => string 'http://rfq.alibaba.com/form.htm?tracelog=header_myalibaba' (length=57)
5 => string 'http://hz.sourcing.alibaba.com/rfq/request/rfq_manage_list.htm?tracelog=nav_ma_mana_rfq' (length=87)
6 => string 'http://biz.alibaba.com/generalorders/list_orders.htm?tracelog=ma_mana_orders' (length=76)
7 => string 'http://sh.vip.alibaba.com/product/post_product_interface.htm?tracelog=newschp_nav_madp' (length=86)
8 => string 'http://sh.vip.alibaba.com/product/manage_products.htm?tracelog=newschp_nav_mamng' (length=80)
9 => string 'http://hz.sourcing.alibaba.com/rfq/quotation/rfq_not_quoted_manage_list.htm?nav_ma_rec_rfqs' (length=91)
10 => string 'http://www.alibaba.com/javascript:;' (length=35)
11 => string 'http://www.alibaba.com/Products?tracelog=beacon_cate_140704' (length=59)
12 => string 'http://rfq.alibaba.com/form.htm?tracelog=header_forbuyers' (length=57)
13 => string 'http://globalexpo.alibaba.com?tracelog=beacon_expo_150820' (length=57)
14 => string 'http://wholesale.alibaba.com?tracelog=nav_ws' (length=44)
15 => string 'http://buyer.alibaba.com/bizid_buyer?tracelog=nav_bi' (length=52)
16 => string 'http://tradeassurance.alibaba.com/bao/buyer_advertise.htm?tracelog=from_home_menu' (length=81)
17 => string 'http://activities.alibaba.com/alibaba/secure-payment.php?tracelog=beacon_payment_150114' (length=87)
18 => string 'http://ecredit.alibaba.com/ecl/buyer.htm?tracelog=beacon_credit_140704' (length=70)
19 => string 'http://inspection.alibaba.com/?tracelog=beacon_is_140704' (length=56)
20 => string 'http://buyer.alibaba.com/intelligence?tracelog=beacon_ti_140704' (length=63)
21 => string 'http://buyer.alibaba.com/forum?tracelog=beacon_df_140704' (length=56)
22 => string 'http://ask.alibaba.com/?tracelog=beacon_ta_140704' (length=49)
23 => string 'http://www.alibaba.com/javascript:;' (length=35)
24 => string 'http://seller.alibaba.com/memberships/index.html?tracelog=seller_channel_member_hp_header' (length=89)
25 => string 'http://seller.alibaba.com/learningcenter?tracelog=seller_channel_lc_hp_header' (length=77)
26 => string 'http://seller.alibaba.com/training.htm?tracelog=seller_channel_training_hp_header' (length=81)
27 => string 'http://sourcing.alibaba.com/?tracelog=newschp_nav_narfq' (length=55)
28 => string 'http://www.alibaba.com/javascript:;' (length=35)怎么能把“http://www.alibaba.com/javascript:;”类似的URL去掉？
QueryList
<?php
//采集某页面所有的图片
$data = QueryList::Query('http://cms.querylist.cc/bizhi/453.html',['image' => ['img','src']])->data;
//打印结果
print_r($data);
//采集某页面所有的超链接
$data = QueryList::Query('http://cms.querylist.cc/google/list_1.html',['link' => ['a','href']])->data;
//打印结果
print_r($data);http://git.oschina.net/jae/QueryList
可以看下这个，比snoopy要强大一些，支持jquery选择器语法