php curl login issue (blank page)

Question

UPDATE: I am now able to to access the main homepage, but i am not logged in.

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://www.xxx.com/?cmd=home');
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch, CURLOPT_POSTFIELDS, 'emailAddress=jeffanderson@tradermail.info&persist=on&pswd=qweqwe&from=/?cmd=home');
curl_setopt ($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
$content = curl_exec ($ch);
curl_close ($ch);

echo $content;

Answer 1

Add curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1); .

Answer 2

curl_exec() returns false if there was a problem:

$content = curl_exec($ch);
if ($content === FALSE) {
      die(curl_error($ch));
}
return($content);

Answer 3

You need to do two things. First, add the following two options to CURL:

curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_MAXREDIRS, 3);

That will tell CURL to follow any redirects. Then, change return to echo. Echo will send the data to the browser. Then you are all set!

Answer 4

after all honorable answer..u put all together in below way

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://www.xxx.com/?cmd=sb-login&from=/?cmd=home');
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch, CURLOPT_POSTFIELDS, 'emailAddress=xxx@tradermail.info&persist=on&pswd=xxx&from=/?cmd=home');
curl_setopt ($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt ($ch, CURLOPT_MAXREDIRS, 10);
$content = curl_exec($ch);
if (FALSE===$content  {
      echo "Follwowing error:".curl_error();
      die(curl_errorno($ch));
}
curl_close ($ch);
return($content);