精通php的curl的入，有点难

精通php的curl的进，有点难
模拟登陆织梦，版本5.7，已经去掉后台验证码，不知道为啥一直登陆不上（提示登陆成功却又跳回登陆地址）

$cookie_file    =    tempnam('./temp','cookie');

$login_url        =    'http://localhost/dedecms/dede/login.php';

$post_fields    =    'gotopage=%2Fdedecms%2Fdede%2Findex.php&dopost=login&adminstyle=newdedecms&userid=admin&pwd=123456&sm1=';



$ch = curl_init($login_url);

curl_setopt($ch, CURLOPT_HEADER, 0);

curl_setopt($ch, CURLOPT_RETURNTRANSFER,0);

curl_setopt($ch, CURLOPT_POST, 1);

curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);

curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);

curl_exec($ch);

curl_close($ch);





$url='http://localhost/dedecms/dede/article_add.php?channelid=1';

$ch = curl_init($url);

curl_setopt($ch, CURLOPT_HEADER, 0);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);

curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file);

$contents = curl_exec($ch);





curl_close($ch);

?>

登陆成功后要跳转到 http://localhost/dedecms/dede/article_add.php?channelid=1

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------解决方案--------------------
dede的登陆类做了限制