PHP - HTTP Post

function curl_xml($_url, $_xmlRequest) {
    $header = array("content-type: text/xml");
    $c = curl_init();// initialize curl handle
    curl_setopt($c, CURLOPT_URL, $_url);// set url to post to
    curl_setopt($c, CURLOPT_HTTPHEADER, $header);//include header as needed
    curl_setopt($c, CURLOPT_HEADER, 0);//not include the header in th output
    curl_setopt($c, CURLOPT_FOLLOWLOCATION, 1); //set follow redirect send by the server
    curl_setopt($c, CURLOPT_MAXREDIR, 5); // Limit redirections to four
    curl_setopt($c, CURLOPT_POST, 1);// set post method in request otherwise curl will do a GET request
    curl_setopt($c, CURLOPT_POSTFIELDS, $_xmlRequest);// add POST fields
    curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);// return into a variable
    curl_setopt($c, CURLOPT_TIMEOUT, 8); // times out after 8s
    $xml_response = curl_exec($c);// run the whole process
    curl_close($c);
    return $xml_response;
}

The most important is to set CURLOPT_RETURNTRANSFER, because by default in PHP curl only sends data to server and do not wait to get response, it sometimes useful to only send request and do not wait for response.

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