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php解决ipv6使curl获取网页内容超时解决办法

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Release: 2016-05-25 16:44:13
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问题原因:如果开启了IPv6,curl默认会优先解析 IPv6,在对应域名没有 IPv6 的情况下,会等待 IPv6 dns解析失败 timeout 之后才按以前的正常流程去找 IPv4,在程序中我对curl获取内容都作了较为严格的超时限制,所以就会造成无法获取内容的问题.

解决的方法是设置默认访问为ipv4,php的curl设置方法具体如下:

$ch = curl_init(); 
curl_setopt ($ch, CURLOPT_URL, $url); 
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true); 
//设置curl默认访问为IPv4 
if(defined('CURLOPT_IPRESOLVE') && defined('CURL_IPRESOLVE_V4')){ 
    curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4); 
} 
 
//设置curl请求连接时的最长秒数,如果设置为0,则无限 
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout); 
//设置curl总执行动作的最长秒数,如果设置为0,则无限 
curl_setopt ($ch, CURLOPT_TIMEOUT,$timeout*3); 
$file_contents = curl_exec($ch); 
curl_close($ch);
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:curl_setopt($ch, CURLOPT_IPRESOLVE,CURL_IPRESOLVE_V4) 只有在php版本5.3及以上版本,curl版本7.10.8及以上版本时,以上设置才生效.


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