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）

<br /><br /><br /><?php<br />$cookie_file    =    tempnam('./temp','cookie');<br />$login_url        =    'http://localhost/dedecms/dede/login.php';<br />$post_fields    =    'gotopage=%2Fdedecms%2Fdede%2Findex.php&dopost=login&adminstyle=newdedecms&userid=admin&pwd=123456&sm1=';<br /><br />$ch = curl_init($login_url);<br />curl_setopt($ch, CURLOPT_HEADER, 0);<br />curl_setopt($ch, CURLOPT_RETURNTRANSFER,0);<br />curl_setopt($ch, CURLOPT_POST, 1);<br />curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);<br />curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);<br />curl_exec($ch);<br />curl_close($ch);<br /><br /><br />$url='http://localhost/dedecms/dede/article_add.php?channelid=1';<br />$ch = curl_init($url);<br />curl_setopt($ch, CURLOPT_HEADER, 0);<br />curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);<br />curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file);<br />$contents = curl_exec($ch);<br /><br /><br />curl_close($ch);<br />?><br /><br /><br />

 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