PHP：有时CURL不返回任何内容

Question

当我尝试使用CURL获取内容但很多时候没有返回任何值..

注意：我在同一网址上测试

CURL CODE

function curltest($url){

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);

$agents = array(
'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:7.0.1) Gecko/20100101 Firefox/7.0.1',
'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100508 SeaMonkey/2.0.4',
'Mozilla/5.0 (Windows; U; MSIE 7.0; Windows NT 6.0; en-US)',
'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7; da-dk) AppleWebKit/533.21.1 (KHTML, like Gecko) Version/5.0.5 Safari/533.21.1'
);
curl_setopt($ch,CURLOPT_USERAGENT,$agents[array_rand($agents)]);

$header[0] = "Accept: text/xml,application/xml,application/xhtml+xml,";
$header[0] .= "text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";
$header[] = "Cache-Control: max-age=0";
$header[] = "Connection: keep-alive";
$header[] = "Keep-Alive: 10";
$header[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";
$header[] = "Accept-Language: en-us,en;q=0.5";
$header[] = "Pragma: ";

curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1); // ADD THIS
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 20);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch,CURLOPT_ENCODING, '');
$output = curl_exec($ch);

if(curl_errno($ch)){
curl_close($ch);
$output = file_get_contents($url);
}
return $output;

}

请提出任何建议或告诉我上述代码是否需要更改

Answer 1

点击此处获取curl php curl options中的所有选项。不同的站点使用不同类型的客户端验证。如果您的卷曲无法在该网站上有效，则可能不会返回任何内容。