检查代理IP的可用性!

  
function curl_string ($url,$proxy)
{
	$user_agent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh- CN; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5 FirePHP/0.2.1"; 
	$ch = curl_init();
	curl_setopt ($ch, CURLOPT_PROXY, $proxy);
	curl_setopt ($ch, CURLOPT_URL, $url);//设置要访问的IP
	curl_setopt ($ch, CURLOPT_USERAGENT, $user_agent);//模拟用户使用的浏览器 
	@curl_setopt ( $ch, CURLOPT_FOLLOWLOCATION, 1 ); // 使用自动跳转  
  	curl_setopt ( $ch, CURLOPT_TIMEOUT, 120 ); //设置超时时间
  	curl_setopt ( $ch, CURLOPT_AUTOREFERER, 1 ); // 自动设置Referer  

	curl_setopt ($ch, CURLOPT_COOKIEJAR, 'c:\cookie.txt');
	curl_setopt ($ch, CURLOPT_HEADER, 1);
	curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
	curl_setopt ($ch, CURLOPT_TIMEOUT, 10);
	$result = curl_exec($ch);
	// Check if any error occured
	if( $result === false)
	{
		error_log(date("H:i:s") . ' Curl 失败: ' . curl_error($ch) ." -- ". $proxy."\n", 3, MYMEDIA.'/log/'.date('Y-m-d').'_Err.log');
	}else{
		error_log(date("H:i:s") . ' Curl 成功: ' . $proxy."\n", 3, MYMEDIA.'/log/'.date('Y-m-d').'_OK.log');
	}
	curl_close($ch);
	return $result;
}