php中出现：Calltoundefinedfunctioncurl_init()的解决方法

3. $ch = curl_init();

4. curl_setopt ($ch, CURLOPT_URL, "http://www.zend.com/");

5. curl_setopt ($ch, CURLOPT_HEADER, 0);

6. curl_exec ($ch);

7. curl_close ($ch);

8. ?>

参见：curl_close(), curl_setopt()