会员登录实现记住密码功能需要用到cookie 和session，首先我们来简单了解一下cookie 和session 的区别
Cookie
Cookie是完全保存在客户端。当客户端禁止cookie时将不能再使用；对服务端压力较小；可以指定生存周期；安全性差。
Session
Session是存放在服务端的。服务端压力较大；关闭浏览器后，session失效；安全性较好。
当制作单纯的会员登录功能，我们只使用session 就可以，但是要实现记住密码功能 就得再加上cookie了，因为cookie 不会随着浏览器关闭而消失，从而实现了下次打开浏览器用户依然是登录的状态
直接上代码
<div class="user-layout clearfix"><div class="formlr-box"><form id="user-form" method="post"><h3>{:lang('log_in')}</h3><ul><li><span>{:lang('form_email')}</span><input type="input" placeholder="" id="email" name="email"/></li><li><span>{:lang('form_password')}</span><input type="password" placeholder="" id="password" name="password"/></li></ul><div class="forgot">{:lang('remember_me')}</div><input type="hidden" name="remember" id="remember" value="0"/><button type="button" onclick="checkForm()">{:lang('log_in')}</button><div class="other"><a href="{:url('reg')}">{:lang('reg')}</a> | <a href="{:url('forget')}">{:lang('forget_pass')}</a></div></form></div></div><script type="application/javascript">function checkForm(){var email = $("#email").val();var password = $("#password").val();var formdata = $("#user-form").serializeArray();if(email == ''){alert("{:lang('alert_no_email')}");$("#email").focus();return false;}if((!isEmail(email))){alert("{:lang('alert_err_email')}");$("#email").focus();return false;}if(password == ''){alert("{:lang('alert_no_password')}");$("#password").focus();return false;}$.post("{:url('login')}", {"formdata": formdata },function(res){if(res.code == 0){window.location.href=res.callback;}else{alert(res.message);return false;}}, "json");}/*判断邮箱格式*/function isEmail(str){var reg = /^(\w)+(\.\w+)*@(\w)+((\.\w+)+)$/;return reg.test(str);}$('.forgot').on('click',function(){if($(this).hasClass('active')){$(this).removeClass('active');$('#remember').val(0);}else{$(this).addClass('active');$('#remember').val(1);}})</script>
public function login(){if (Request::instance()->isPost()){$formdata = input('post.formdata/a');$data = array();$username = $formdata[0]['value'];$password = $formdata[1]['value'];$remember = $formdata[2]['value'];/*检查用户是否存在*/$member = $this->MemberDb->where(array('email'=>$username,'is_status'=>1))->find();if($member){/*检查密码是否正确*/if($member['password'] != md5($password)){ajax_return('','Password input error',1);}else{$auth = array('uid' => $member['uid'],'username' => $member['username']);session('member_auth', $auth);if($remember == 1){cookie('union_member_auth', $auth, time()+3600*24*30);//保存时间为30天}ajax_return('','Success',0,url('index'));}}else{ajax_return('','user does not exist',1);}}/*Mate信息*/$meta_title = 'Login - '.$this->Config['sitename'];$meta_keywords = '';$meta_description = '';$this->assign('meta_title', $meta_title);$this->assign('meta_keywords', $meta_keywords);$this->assign('meta_description', $meta_description);/*模板渲染*/return view();}
