//一、获取当前时间戳

方法1：通过time函数1 time();方法2：通过$_SERVER中的REQUEST_TIME元素$_SERVER['REQUEST_TIME'];方法3:通过strtotime函数strtotime('now'));二、获取当前时间通过date函数格式化时间戳1 echo date('Y-m-d h:i:s', time()); // 2016-12-31 05:07:05

date_default_timezone_set('PRC'); //默认时区

echo "今天:",date("Y-m-d",time()),"<br>"; echo "今天:",date("Y-m-d",strtotime("18 june 2008")),"<br>"; echo "昨天:",date("Y-m-d",strtotime("-1 day")), "<br>"; echo "明天:",date("Y-m-d",strtotime("+1 day")), "<br>"; echo "一周后:",date("Y-m-d",strtotime("+1 week")), "<br>"; echo "一周零两天四小时两秒后:",date("Y-m-d G:H:s",strtotime("+1 week 2 days 4 hours 2 seconds")), "<br>"; echo "下个星期四:",date("Y-m-d",strtotime("next Thursday")), "<br>"; echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."<br>"; echo "一个月前:".date("Y-m-d",strtotime("last month"))."<br>"; echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."<br>"; echo "十年后:".date("Y-m-d",strtotime("+10 year"))."<br>";

jquery.min.js

<tr><td style="width:13%; text-align: right;"><label >姓名</label></td><td style="width:87%;"><input type="text" name="username" value="" id="User_username" οnkeyup="this.value=this.value.replace(/\s+/g,'')" placeholder="4-15位用户名"/><span class="uer_class"></span></td></tr>

js部分

<script type="text/javascript" src="PUBLIC/js/jquery.min.js"></script><script type="text/javascript">$(function (){ var user_Boolean = false;$("#User_username").blur(function (){ var name = $("#User_username").val();if(name != ''){ var url ='checknm';var data ={"name":name};var success =function (response){ if(response.error == 0){ $('.uer_class').html("已经存在用户").css("color","red");user_Boolean = false;}if(response.error == 1){ $('.uer_class').html("✔可以使用").css("color","green");user_Boolean = true;}}$.post(url,data,success,"json");}else{ $('.uer_class').html("请输入用户名").css("color","red");user_Boolean = false;}});

$('.red_button').click(function(){                    if(user_Boolean == true){                        alert("注册成功");                        $("form").submit();                    }else {                        alert("请完善信息");                    }                });            });                php后台部分        function checknm($name){   $info = D('user')->where("user_name ='$name'")->find();  if($info){      $response = array(              'error'=>0,              'errmsg'=>'用户已经存在',              'data' =>false      );  }else{      $response = array(              'error'=>1,              'errmsg'=>'可以使用',              'data' =>true      );  }   echo json_encode($response);

}