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I try PHP Post Request inside a POST Request thinking it might be useful for me. My code is given below: $sub_req_url = "http://localhost/index1.php"; $ch = curl_init($sub_req_url); $encoded = ''; // include GET as well as POST variables; your needs may vary. foreach($_GET as $name => $value) { $encoded .= urlencode($name).'='.urlencode($value).'&'; } foreach($_POST as $name => $value) { $encoded .= urlencode($name).'='.urlencode($value).'&'; } // chop off last ampersand $encoded = substr($encoded, 0, strlen($encoded)-1); curl_setopt($ch, CURLOPT_POSTFIELDS, $encoded); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_POST, 1); curl_exec($ch); curl_close($ch); from the index.php file and index2.php is another file in the same directory and when I open the page I get the following error in my error.log file: [Sat Dec 18 15:24:53 2010] [error] [client ::1] PHP Fatal error: Call to undefined function curl_init() in /var/www/testing1/index.php on line 5 What I want to do is to have a reservation form that send post request. Then I want to process post values and send again the post request to paypal.

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