PHP CURL采集百度搜寻结果图片不显示问题的解决方法

<?php
function docurl($url, $data=array(), $header=array(), $timeout=30){
  $ch = curl_init();
  curl_setopt($ch, curlopt_url, $url);
  curl_setopt($ch, curlopt_httpheader, $header);
  curl_setopt($ch, curlopt_returntransfer, true);
  curl_setopt($ch, curlopt_followlocation, true);
  curl_setopt($ch, curlopt_timeout, $timeout);
  $response = curl_exec($ch);
  if($error=curl_error($ch)){
    die($error);
  }
  curl_close($ch);
  return $response;
}
$wd = '仙剑奇侠传';
$url = 'http://www.baidu.com/s?wd='.urlencode($wd);
$data = array();
$header = array();
$response = docurl($url, $data, $header, 5);
echo $response;
?>

var list = {
    "graph.baidu.com": "http://graph.baidu.com",
    "t1.baidu.com":"http://t1.baidu.com",
    "t2.baidu.com":"http://t2.baidu.com",
    "t3.baidu.com":"http://t3.baidu.com",
    "t10.baidu.com":"http://t10.baidu.com",
    "t11.baidu.com":"http://t11.baidu.com",
    "t12.baidu.com":"http://t12.baidu.com",
    "i7.baidu.com":"http://i7.baidu.com",
    "i8.baidu.com":"http://i8.baidu.com",
    "i9.baidu.com":"http://i9.baidu.com",
};

var list = {
    "graph.baidu.com": "https://sp0.baidu.com/-ayhfd0a2gu2pmbgoy3k",
    "t1.baidu.com":"https://ss0.baidu.com/6on1bjeh1bf3odcf",
    "t2.baidu.com":"https://ss1.baidu.com/6oz1bjeh1bf3odcf",
    "t3.baidu.com":"https://ss2.baidu.com/6ov1bjeh1bf3odcf",
    "t10.baidu.com":"https://ss0.baidu.com/6onwsjip0qiz8tyhnq",
    "t11.baidu.com":"https://ss1.baidu.com/6onxsjip0qiz8tyhnq",
    "t12.baidu.com":"https://ss2.baidu.com/6onysjip0qiz8tyhnq",
    "i7.baidu.com":"https://ss0.baidu.com/73f1bjeh1bf3odcf",
    "i8.baidu.com":"https://ss0.baidu.com/73x1bjeh1bf3odcf",
    "i9.baidu.com":"https://ss0.baidu.com/73t1bjeh1bf3odcf",
};

<?php
function docurl($url, $data=array(), $header=array(), $timeout=30){
  $ch = curl_init();
  curl_setopt($ch, curlopt_url, $url);
  curl_setopt($ch, curlopt_httpheader, $header);
  curl_setopt($ch, curlopt_returntransfer, true);
  curl_setopt($ch, curlopt_followlocation, true);
  curl_setopt($ch, curlopt_timeout, $timeout);
  $response = curl_exec($ch);
  if($error=curl_error($ch)){
    die($error);
  }
  curl_close($ch);
  return $response;
}
// 域名转换
function cdomain($str){
  $baidu_domain = '{
    "http://graph.baidu.com": "https://sp0.baidu.com/-ayhfd0a2gu2pmbgoy3k",
    "http://p.qiao.baidu.com":"https://sp0.baidu.com/5poxdtebkgqfm2e88ium_a",
    "http://vse.baidu.com":"https://sp3.baidu.com/6qudsjip0qiz8tyhnq",
    "http://hdpreload.baidu.com":"https://sp3.baidu.com/7lawfjuc_wui8t7jm9ickt-xh_",
    "http://lcr.open.baidu.com":"https://sp2.baidu.com/8luysjw91qh3otqbppnn2djv",
    "http://kankan.baidu.com":"https://sp3.baidu.com/7bm1dzeakgqfm2e88ium_a",
    "http://xapp.baidu.com":"https://sp2.baidu.com/ylmwfhsm2q5ilbglnyg",
    "http://dr.dh.baidu.com":"https://sp0.baidu.com/-kz1ad0a2gu2pmbgoy3k",
    "http://xiaodu.baidu.com":"https://sp0.baidu.com/ylshczq6kgqfm2e88ium_a",
    "http://sensearch.baidu.com":"https://sp1.baidu.com/5b11fzupbgm18t7jm9ickt-xh_",
    "http://s1.bdstatic.com":"https://ss1.bdstatic.com/5en1bjq8aauym2zgoy3k",
    "http://olime.baidu.com":"https://sp0.baidu.com/8bg4ctva2gu2pmbgoy3k",
    "http://app.baidu.com":"https://sp2.baidu.com/9_qwsjip0qiz8tyhnq",
    "http://i.baidu.com":"https://sp0.baidu.com/74oibt3kamgdnd_",
    "http://c.baidu.com":"https://sp0.baidu.com/9foibt3kamgdnd_",
    "http://sclick.baidu.com":"https://sp0.baidu.com/5bu_dtmfkgqfm2e88ium_a",
    "http://nsclick.baidu.com":"https://sp1.baidu.com/8qujcd3n0sgco2kml5_y_d3",
    "http://sestat.baidu.com":"https://sp1.baidu.com/5b1zede5kgqfm2e88ium_a",
    "http://eclick.baidu.com":"https://sp3.baidu.com/-0u_dtmfkgqfm2e88ium_a",
    "http://api.map.baidu.com":"https://sp2.baidu.com/9_q4sjopb1gco2kml5_y_d3",
    "http://ecma.bdimg.com":"https://ss1.bdstatic.com/-0u0bxsm1a5bphglnyg",
    "http://ecmb.bdimg.com":"https://ss0.bdstatic.com/-0u0bnsm1a5bphglnyg",
    "http://t1.baidu.com":"https://ss0.baidu.com/6on1bjeh1bf3odcf",
    "http://t2.baidu.com":"https://ss1.baidu.com/6oz1bjeh1bf3odcf",
    "http://t3.baidu.com":"https://ss2.baidu.com/6ov1bjeh1bf3odcf",
    "http://t10.baidu.com":"https://ss0.baidu.com/6onwsjip0qiz8tyhnq",
    "http://t11.baidu.com":"https://ss1.baidu.com/6onxsjip0qiz8tyhnq",
    "http://t12.baidu.com":"https://ss2.baidu.com/6onysjip0qiz8tyhnq",
    "http://i7.baidu.com":"https://ss0.baidu.com/73f1bjeh1bf3odcf",
    "http://i8.baidu.com":"https://ss0.baidu.com/73x1bjeh1bf3odcf",
    "http://i9.baidu.com":"https://ss0.baidu.com/73t1bjeh1bf3odcf",
    "http://b1.bdstatic.com":"https://ss0.bdstatic.com/9un1bjq8aauym2zgoy3k",
    "http://ss.bdimg.com":"https://ss1.bdstatic.com/5av1bjqh_q23odcf",
    "http://opendata.baidu.com":"https://sp0.baidu.com/8aqdcjqpaav3otqbppnn2djv",
    "http://api.open.baidu.com":"https://sp0.baidu.com/9_q4sjw91qh3otqbppnn2djv",
    "http://tag.baidu.com":"https://sp1.baidu.com/6lmfsjip0qiz8tyhnq",
    "http://f3.baidu.com":"https://sp2.baidu.com/-uv1bjeh1bf3odcf",
    "http://s.share.baidu.com":"https://sp0.baidu.com/5fozdde71mgco2kml5_y_d3",  
    "http://bdimg.share.baidu.com":"https://ss1.baidu.com/9ra4ct8abw9fktbgoi7o1ygwehsv",
    "http://1.su.bdimg.com":"https://ss0.bdstatic.com/k4ozexsm1a5bphglnyg",
    "http://2.su.bdimg.com":"https://ss1.bdstatic.com/kvozexsm1a5bphglnyg",
    "http://3.su.bdimg.com":"https://ss2.bdstatic.com/kfozexsm1a5bphglnyg",
    "http://4.su.bdimg.com":"https://ss3.bdstatic.com/lpozexsm1a5bphglnyg",
    "http://5.su.bdimg.com":"https://ss0.bdstatic.com/l4ozexsm1a5bphglnyg",
    "http://6.su.bdimg.com":"https://ss1.bdstatic.com/lvozexsm1a5bphglnyg",
    "http://7.su.bdimg.com":"https://ss2.bdstatic.com/lfozexsm1a5bphglnyg",
    "http://8.su.bdimg.com":"https://ss3.bdstatic.com/ipozexsm1a5bphglnyg"
  }';
  $domain = json_decode($baidu_domain, true);
  foreach($domain as $k=>$v){
    $str = str_replace($k, $v, $str);
  }
  return $str;
}
$wd = '仙剑奇侠传';
$url = 'http://www.baidu.com/s?wd='.urlencode($wd);
$data = array();
$header = array();
$response = docurl($url, $data, $header, 5);
echo cdomain($response); // 调用域名转换
?>