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I heard about external access of a website using curl by the following code:
$curl_handle=curl_init();
curl_setopt($curl_handle,CURLOPT_URL,'http://example.com');
$buffer=curl_exec($curl_handle);
curl_close($curl_handle);
I want to protect my website from this external access. I am using PHP. How can I protect my web site?
If you mean “how do I protect my website against being accessed by a program other than a browser”, the answer is pretty much “you can’t.” A browser is just a program that sends HTTP requests. You can play the game of trying to reject HTTP requests that look like they don’t come from a browser, but it’s trivially easy for an arbitrary program (one using curl, or Perl/Python/Ruby libraries) to mimic the headers that a “real” browser sends.