PHP实现百度收录判断

<?php
$sl_url = (isset($_GET['url']))?$_GET['url']:$_POST['url'];
if(empty($sl_url))  echo '查询网址不能为空';

$data = BD_curl('https://www.baidu.com/s?wd='.urlencode($sl_url));

if(!isset($data))  showjson(array('code'=>202702,'msg'=>'查询失败，请重试！'));

if(strpos($data,'提交网址')){
    showjson(array('code'=>202703,'url'=>$sl_url,'msg'=>'该网址未被收录！'));
}else{
    showjson(array('code'=>1,'url'=>$sl_url,'msg'=>'该网址已被收录！'));
    
}  
function BD_curl($url, $post=0, $referer=0, $cookie=0, $header=0, $ua=0, $nobaody=0){
    $ch = curl_init();
    $ip = rand(0,255).'.'.rand(0,255).'.'.rand(0,255).'.'.rand(0,255) ;
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

    $httpheader[] = "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
    $httpheader[] = "Accept-Encoding: gzip, deflate, sdch, br";
    $httpheader[] = "Accept-Language: zh-CN,zh;q=0.8";
    $httpheader[] = 'X-FORWARDED-FOR:'.$ip;
    $httpheader[] = 'CLIENT-IP:'.$ip;
    curl_setopt($ch, CURLOPT_HTTPHEADER, $httpheader);
    if ($post) {
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
    }
    if ($header) {
        curl_setopt($ch, CURLOPT_HEADER, true);
    }
    if ($cookie) {
        curl_setopt($ch, CURLOPT_COOKIE, $cookie);
    }
    if($referer){
        if($referer==1){
            curl_setopt($ch, CURLOPT_REFERER, 'https://www.baidu.com');
        }else{
            curl_setopt($ch, CURLOPT_REFERER, $referer);
        }
    }
    if ($ua) {
        curl_setopt($ch, CURLOPT_USERAGENT, $ua);
    }
    else {
        curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1");
    }
    if ($nobaody) {
        curl_setopt($ch, CURLOPT_NOBODY, 1);
    }
    curl_setopt($ch, CURLOPT_TIMEOUT, 3);
    curl_setopt($ch, CURLOPT_ENCODING, "gzip");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $ret = curl_exec($ch);
    //$Headers = curl_getinfo($ch);
    curl_close($ch);
    return $ret;
}
function showjson($arr){
 header("Content-Type: application/json; charset=utf-8");
 exit(json_encode($arr,320));
}
?>