最近,我把使用Curl的爬虫代码移植到了CodeIgniter中。我使用了来自http://philsturgeon.co.uk/code/codeigniter-curl的Curl CI库。我将爬虫过程放在了一个控制器中,但是我发现在CodeIgniter中执行爬虫的时间比我在纯PHP中构建的要慢。
输出结果需要12秒才能在CodeIgniter中完成,而在纯PHP中只需要6秒。两者都包括使用HTML DOM解析器进行解析的过程。
以下是我在CodeIgniter中的Curl代码:
function curl($url, $postdata=false)
{
$agent = "Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax)";
$this->curl->create($url);
$this->curl->ssl(false);
$options = array(
'URL' => $url,
'HEADER' => 0,
'AUTOREFERER' => true,
'FOLLOWLOCATION' => true,
'TIMEOUT' => 60,
'RETURNTRANSFER' => 1,
'USERAGENT' => $agent,
'COOKIEJAR' => dirname(__FILE__) . "/cookie.txt",
'COOKIEFILE' => dirname(__FILE__) . "/cookie.txt",
);
if($postdata)
{
$this->curl->post($postdata, $options);
}
else
{
$this->curl->options($options);
}
return $this->curl->execute();
}
非CodeIgniter(纯PHP)代码:
function curl($url, $binary=false, $post=false, $cookie=false) {
// 在这里编写curl功能代码
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // Accepts all CAs
curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt ($ch, CURLOPT_URL, $url );
curl_setopt ($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_REFERER, $url);
curl_setopt($ch, CURLOPT_ENCODING, 'gzip,deflate');
curl_setopt($ch, CURLOPT_AUTOREFERER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
if($cookie){
$agent = "Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax)";
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
curl_setopt($ch, CURLOPT_COOKIEJAR, dirname(__FILE__) . "/cookie.txt");
curl_setopt($ch, CURLOPT_COOKIEFILE, dirname(__FILE__) . "/cookie.txt");
}
if($binary)
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
if($post){
foreach($post as $key=>$value)
{
$post_array_string1 .= $key.'='.$value.'&';
}
$post_array_string1 = rtrim($post_array_string1,'&');
//set the url, number of POST vars, POST data
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_array_string1);
}
return curl_exec ($ch);
有人知道为什么这个CodeIgniter Curl比较慢吗?或者可能是因为simple_html_dom解析器的原因吗?