使用CURL和PHP的POST请求无法正常工作

Question

I am trying to programmatically process my statement using the form at http://nlp.stanford.edu:8080/corenlp/process . I have the following code snippet in PHP/CURL. However, instead of processing the statement, it is returning the HTML for the form - as if the post parameters are not being sent. I checked that I am sending the required paramaters. Can someone guide me as to what I am doing wrong?

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, "http://nlp.stanford.edu:8080/corenlp/process");
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ch, CURLOPT_USERAGENT,"Mozilla/14.0 (compatible; MSIE 6.0; Windows NT 5.1)");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_POST, true);

$data  = array(
    'outputFormat' => 'xml',
    'input' => 'Here is a statement to process',
    'Process' => 'Submit Query'
     );

curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

$result = curl_exec($ch);
echo $result;

Answer 1

You have to convert the $data array into a string... Also, Be sure to urlencode() the individual values.

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, "http://nlp.stanford.edu:8080/corenlp/process");
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ch, CURLOPT_USERAGENT,"Mozilla/14.0 (compatible; MSIE 6.0; Windows NT 5.1)");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_POST, true);

$data  = array(
"outputFormat" => "xml",
"input" => "Here is a statement to process",
"Process" => "Submit Query"
 );

$data_string = "";

foreach($data as $key=>$value){ /// YOU HAVE TO DO THIS
$data_string .= $key.'='.urlencode($value).'&';  /// AND THIS
}

curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
$result = curl_exec($ch);
echo $result;