PHPの場合：未定義の関数curl_init()を呼び出す解決策

$ch =curl_init();
curl_setopt ($ch, CURLOPT_URL, "http://www.zend.com/ ");
curl_setopt ($ch, CURLOPT_HEADER, 0);
curl_exec ($ch);
curl_close ($ch);
?>

参见：curl_close()、curl_setopt()