PHP session 防止重復(fù)登錄的妙招

zhclass.php

con?=?mysql_connect("localhost",?"root",?"root");
????????mysql_query("set?names?'utf8'");
????????if?(!?$this->con)?{
????????????die('連接服務(wù)器失敗:?'?.?mysql_error());
????????}?else?{
????????????mysql_select_db("mytest",?$this->con);
????????}
????}

????function?logging($id,?$mm)?//?登錄
????{
????????$this->zh?=?$id;
????????$this->mm?=?$mm;
????????if?(!?$this->checkZh())?{
????????????return?false;
????????}
????????//?判斷字段是否存在
????????$result?=?mysql_query("SELECT?*?FROM?teacher?WHERE?id=$id");
????????if?(mysql_num_rows($result)?!=?0)?{
????????????$row?=?mysql_fetch_array($result);
????????????$m_mima?=?$row['mima'];
????????????$name?=?$row['name'];
????????????if?($mm?==?$m_mima)?{
????????????????echo?"登錄成功";
????????????????return?true;
????????????}?else?{
????????????????echo?"密碼錯(cuò)誤";
????????????}
????????}?else?{
????????????echo?"登錄失敗";
????????}
????????return?false;
????}

????function???GetZhSession($zh)
????{
????????if($this->checkZh2($zh)==false)
????????{
????????????return??null;

????????}

????????$result?=?mysql_query("SELECT?*?FROM?teacher?WHERE?id=$zh");
????????if(mysql_num_rows($result)>0)
????????{
??????????$row?=?mysql_fetch_array($result);
??????????$session?=?$row['sec'];
??????????return??$session;

????????}else?{
????????????return??null;
????????}
????}

????function???SetZhSession($zh,$sec)
????{
????????if($this->checkZh2($zh)==false)
????????{
????????????return??false;

????????}
????????if?(mysql_query("UPDATE?teacher?SET?sec='$sec'?WHERE?id=$zh")==false)
????????{
????????????return??false;
????????}

????????return??true;
????}

????function?_ChangeUserName($mid,?$mm,?$newName)
????{
????????$this->zh?=?$mid;
????????$this->mm?=?$mm;
????????if?(!?$this->checkZh())?{
????????????echo?"賬號(hào)不存在!";
????????????return?false;
????????}

????????if?(!?$this->logging($mid,?$mm))?{
????????????return?false;
????????}
????????echo?$newName?.?","?.?$mm;
????????//?傳過來的是字符串?但是數(shù)據(jù)庫不識(shí)別?加上兩個(gè)單引號(hào)轉(zhuǎn)為字符串?'$newName'
????????$ret?=?mysql_query("UPDATE?teacher?SET?name='$newName'?WHERE?id=$mid");
????????if?(!?$ret)?{
????????????echo?"?無法修改用戶昵稱?";
????????}
????}

????public?function?Reg($zh,?$mima,?$nichen)
????{
????????$this->zh?=?$zh;
????????$this->mm?=?$mima;

????????if?($this->checkZh())?{
????????????echo?"賬號(hào)已存在";
????????????return;
????????}
????????if?(mysql_query("INSERT?INTO?teacher?(name,id,mima)?VALUES?('$nichen',$zh,'$mima')")?==?false)?{
????????????echo?"注冊(cè)失敗";
????????}?else?{
????????????echo?"注冊(cè)成功";
????????}
????}

????public?function?__destruct()?//?析構(gòu)函數(shù)銷毀數(shù)據(jù)庫連接
????{
????????mysql_close($this->con);
????}
}
?>

index.php

GetZhSession($_SESSION["VVV"])==session_id())
????{
????????echo?"已經(jīng)登錄";
????}else?{
????????echo?"登錄過期?。?！";
????}

????return?;
}?else?{
????//?未登錄
????echo?"log";
????return?;
}??

?>

denglu.php

type==0){
????if(?$pobj->logging($obj->id,?$obj->pwd)?==true)
????{

????????$_SESSION["VVV"]?=?$obj->id;
????????echo?$_SESSION["VVV"];
????????$pobj->SetZhSession($obj->id,session_id()?);
????????echo?"登陸成功";
????}
}else{
????echo?"未定義";
}

?>

~~~~~~~~~~~~~~~~~~~~使用xhr post登錄~~~~~~~~~~~~~~~~~~~~~~~~~~~

使用post登錄 ,確定登錄后再執(zhí)行其他post,防止異步獲取多個(gè)session

function??logging()
????{
????????var??x?=?new?XMLHttpRequest();

????????x.onreadystatechange?=function()
????????{
????????????if(x.readyState?==?4)?{

????????????????if(x.status?==?200)?{
????????????????????console.log("The?server?replied?with:?"?+?x.responseText);
????????????????????txt.text?=?x.responseText;

????????????????}


????????????}
????????};
????????var?xxx?=?new?Object;
????????xxx.id="289672082";
????????xxx.pwd?=?'12345';
????????xxx.type=0;
????????var?pcode=??JSON.stringify(xxx);
????????x.open("POST","http://192.168.0.105/mycode/Test/denglu.php",true);
????????//post請(qǐng)求要自己設(shè)置請(qǐng)求頭
????????x.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

????????x.send("code="+pcode);
????}

如果用戶沒有登錄嘗試其他行為,在返回值中要求用戶登錄:

??function?_PHP_TEST(async)
????{
????????var??x?=?new?XMLHttpRequest();

????????x.onreadystatechange?=function()
????????{
????????????if(x.readyState?==?4)?{

????????????????if(x.status?==?200)?{

????????????????????if(x.responseText=="log")
????????????????????{
????????????????????????console.log("The?server?replied?with:?"?+?x.responseText);
????????????????????????console.log("需要登錄");
????????????????????????logging();
????????????????????}else{


????????????????????????console.log("The?server?replied?with:?"?+?x.responseText);
????????????????????????txt.text?=?x.responseText;


????????????????????}
????????????????}


????????????}
????????};
????????x.open("POST","http://192.168.0.105/mycode/Test/index.php",async);
????????//post請(qǐng)求要自己設(shè)置請(qǐng)求頭
????????x.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
????????x.send(null);

????}

~~~~~~~~~~~~~~~~使用Qt C++登錄~~~~~~~~~~~~~~~~~~~~~~~~~~

QmlClass::QmlClass(QObject?*parent)?:?QObject(parent)
{

????QByteArray??data="";
????m_netManger?=?new?QNetworkAccessManager(this);
????QNetworkRequest?network_request;



????//設(shè)置頭信息
????network_request.setHeader(QNetworkRequest::ContentTypeHeader,?"application/x-www-form-urlencoded");
????network_request.setHeader(QNetworkRequest::ContentLengthHeader,?data.length());

????//設(shè)置url
????network_request.setUrl(QUrl("http://localhost/mycode/Test/index.php"));


????//發(fā)送請(qǐng)求??獲取一些關(guān)鍵數(shù)據(jù)?前提是已近登錄
????QNetworkReply?*reply2=m_netManger->post(network_request,?data);
????connect(reply2,&QNetworkReply::readyRead,this,[=](){
????????QString?t?=reply2->readAll();
????????if(t=="log"??&&?t.length()>0)
????????{
????????????qDebug()<Loging();?
????????}
????????qDebug()<<"?POST返回"<post(network_request,?data);
????connect(reply2,&QNetworkReply::readyRead,this,[=](){
????????QString?t?=reply2->readAll();
????????qDebug()<<"登錄返回值"<<t;
????});

????return???true;

}