discuz登入流程解析，最近在研究，Ucenter的同步登陸機制，就先從discuz的登入開始了

1.form表單提交

member.php?mod=logging&action=login&loginsubmit=yes&handlekey=login&loginhash=Lm137&inajax=1
處理指令碼  source/module/member/member_logging.php $ctl_obj =new logging_ctl();//初始化登陸物件,source\class\class_member.php=>class logging_ctl

$ctl_obj->setting = $_G['setting'];$method ='on_'.$_GET['action'];//$method='on_login';$ctl_obj->template='member/login';$ctl_obj->$method();//呼叫source\class\class_member.php=>on_login() 下面對source\class\class_member.php的on_login進行分析
2.source\class\class_member.php    on_login函式太長，只貼出其核心部分，該函式也是登入過程中的核心函式，通過 userlogin（

uc_client\control\user.php）進行資料分析，並對返回結果$result進行分析處理，返回結果$result['status']>0時，顯示登陸成功，setloginstatus進行登入狀態記錄 $result = userlogin($_GET['username'], $_GET['password'], $_GET['questionid'], $_GET['answer'], $this->setting['autoidselect']?'auto': $_GET['loginfield'], $_G['clientip']);//95行左右，userlogin為核心處理函式，來至uc_client\client.php//根據$result['status']返回值進行處理

············if($result['status']>0)//當$result['status']>0時，為登陸成功setloginstatus($result['member'], $_GET['cookietime']?2592000:0);//記錄登入狀態，完成登入動作 下面對uc_client\client.php的uc_user_login進行分析 3.uc_client\client.php
函式uc_user_login通過call_user_func呼叫uc_client\control\user.php的onlogin函式 function uc_user_login($username, $password, $isuid =0, $checkques =0, $questionid ='', $answer ='', $ip =''){ $isuid = intval($isuid); $return = call_user_func(UC_API_FUNC,'user','login', array('username'=>$username,'password'=>$password,'isuid'=>$isuid,'checkques'=>$checkques,'questionid'=>$questionid,'answer'=>$answer,'ip'=> $ip));//UC_API_FUNC= uc_api_mysql，通過call_user_func回撥呼叫uc_api_mysql,進行傳引數，通過uc_api_mysql引入uc_client\control\user.php的onlogin函式return UC_CONNECT =='mysql'? $return : uc_unserialize($return);}...................function uc_api_mysql($model, $action, $args=array()){global $uc_controls;if(empty($uc_controls[$model])){if(function_exists("mysql_connect")){ include_once UC_ROOT.'./lib/db.class.php';}else{ include_once UC_ROOT.'./lib/dbi.class.php';} include_once UC_ROOT.'./model/base.php'; include_once UC_ROOT."./control/$model.php";//引入uc_client\control\user.phpeval("\$uc_controls['$model'] = new {$model}control();");}if($action{0}!='_'){ $args = uc_addslashes($args,1, TRUE); $action ='on'.$action; $uc_controls[$model]->input = $args;return $uc_controls[$model]->$action($args);//呼叫uc_client\control\user.php的onlogin函式傳引數}else{return'';}} 4.uc_client\control\user.php
onlogin函式對資料進行分析，返回結果，回第2步中source\class\class_member.php的 function onlogin(){ $this->init_input(); $isuid = $this->input('isuid'); $username = $this->input('username'); $password = $this->input('password'); $checkques = $this->input('checkques'); $questionid = $this->input('questionid'); $answer = $this->input('answer'); $ip = $this->input('ip'); $this->settings['login_failedtime']= is_null($this->settings['login_failedtime'])?5: $this->settings['login_failedtime'];if($ip && $this->settings['login_failedtime']&&!$loginperm = $_ENV['user']->can_do_login($username, $ip)){ $status =-4;return array($status,'', $password,'',0);}if($isuid ==1){ $user = $_ENV['user']->get_user_by_uid($username);} elseif($isuid ==2){ $user = $_ENV['user']->get_user_by_email($username);}else{ $user = $_ENV['user']->get_user_by_username($username);} $passwordmd5 = preg_match('/^\w{32}$/', $password)? $password : md5($password);if(empty($user)){ $status =-1;} elseif($user['password']!= md5($passwordmd5.$user['salt'])){ $status =-2;} elseif($checkques && $user['secques']!= $_ENV['user']->quescrypt($questionid, $answer)){ $status =-3;}else{ $status = $user['uid'];}if($ip && $this->settings['login_failedtime']&& $status <=0){ $_ENV['user']->loginfailed($username, $ip);} $merge = $status !=-1&&!$isuid && $_ENV['user']->check_mergeuser($username)?1:0;return array($status, $user['username'], $password, $user['email'], $merge);} 登入解析完成完成