PHP如何通過AJAX方式實現登入功能_php執行個體

本文執行個體講述了Ajax+PHP+MySQL登陸樣本。分享給大家供大家參考。具體如下：
運行效果如下：

具體代碼如下：

1 login.php
登入介面中,javascript指令碼用ajax方式非同步請求dologin.php,dologin.php負責使用者資訊驗證(包括驗證碼,php產生驗證碼可以自行搜尋).登入介面的代碼如下:

<?php session_start();?>   login                      Ajax PHP Demo System         
         Author:wangming      DateTime:2009-9-1   Version:1.0.0   Email:wangmingemail@163.com                  
    姓名:wangming
    電商06-2
                                  ©Copyright 2015.  

2 ajaxhelper.js

function createRequest() { try {  request = new XMLHttpRequest(); } catch (tryMS) {  try {   request = new ActiveXObject("Msxml2.XMLHTTP");  } catch (otherMS) {   try {    request = new ActiveXObject("Microsoft.XMLHTTP");   } catch (failed) {    request = null;   }  } } return request;}function getActivatedObject(e) { var obj; if (!e) {  // early version of IE  obj = window.event.srcElement; } else if (e.srcElement) {  // IE 7 or later  obj = e.srcElement; } else {  // DOM Level 2 browser  obj = e.target; } return obj;}function addEventHandler(obj, eventName, handler) { if (document.attachEvent) {  obj.attachEvent("on" + eventName, handler); } else if (document.addEventListener) {  obj.addEventListener(eventName, handler, false); }}

3 dologin.php

<?php session_start(); header("Content-type:text/html;charset=gb2312");//防止返回的中文亂碼 $name=$_POST['username']; $pwd=$_POST['password']; $imagecode=$_POST['code']; if(strtoupper($imagecode)==$_SESSION["code"]) {  include("conn/conn.php");  $sql="select studentName,studentPwd from tbstudent where studentId='".$name."'";  $result=mysql_query($sql,$conn);  if($row=mysql_fetch_assoc($result))  {   if($pwd==$row['studentPwd'])   {   $_SESSION['username']=$row['studentName'];   //echo "{'result':true,'info':'登陸成功!','code':'".$_SESSION["code"]."'}";   echo "{'result':true,'info':'登陸成功!'}";      }   else   {   echo "{'result':false,'info':'密碼錯誤!'}";   }  }  else  {   echo "{'result':false,'info':'該使用者不存在!'}";  } } else {  echo "{'result':false,'info':'驗證碼錯誤!'}"; }?>

4 conn.php

<?php $conn=$mysql_connect("localhost","root", ""); mysql_select_db("bbs",$conn); mysql_query("SET NAMES GB2312"); ?> 5 <?phpclass Users { function Users() { } function checkLogin($username, $userpwd) {  try {   mysql_connect("localhost", "root", "123");   mysql_select_db("studentdb");   mysql_query("SET NAMES GB2312");   $sql = "select userid from tbuser where username='$username' and userpwd='" . md5(trim($userpwd)) . "'";   $result = mysql_query($sql);   if ($result) {    $arr = mysql_fetch_row($result);    $uid = $arr[0];    if ($uid != "") {     return "true|$uid login ok.$sql";     mysql_close();    } else {     return "false|login failed!$sql";     mysql_close();    }   } else {    return "false|$result link db failed!";    mysql_close();   }  }  catch(Exception $ex) {   return "false|$ex";   mysql_close();  } } function AddUser($name, $pwd) {  try {   mysql_connect("localhost", "root", "123");   mysql_select_db("studentdb");   mysql_query("set names gb2312");   $sql0 = mysql_query("select userid from tbuser where username='$name'");   $info0 = mysql_fetch_array($sql0);   $userid = $info0[0];   if ($info0 != false) {    return "false | $name is exisis.(id:$userid)";   }   $pwd = md5(trim($pwd));   $query = mysql_query("insert into tbuser(username,userpwd)values('$name','$pwd')");   $error = mysql_errno();   if ($query) {    return "true | add ok";   } else {    return "false | $error";   }  }  catch(Exception $ex) {   return "false | $ex";  } } function DeleteUser($name) {  mysql_connect("localhost", "root", "123");  mysql_select_db("studentdb");  mysql_query("set names gb2312");  $name = trim($name);  $sql0 = mysql_query("select userid from tbuser where username='$name'");  $info0 = mysql_fetch_array($sql0);  if ($info0 != false) {   if (mysql_query("delete from tbuser where username='$name'")) {    return "true | delete ok.(id:" . $info0[0] . ")";   } else {    return "false | 刪除失敗";   }  } else {   return "false | 刪除失敗 $name 不存在";  } } function UpdateUser($id, $name, $pwd) {  if (is_numeric(intval(trim($id)))) {   if ($id && $name && $pwd) {    mysql_connect("localhost", "root", "123");    mysql_select_db("studentdb");    mysql_query("set names gb2312");    $pwd = md5(trim($pwd));    $isexists = mysql_query("select * from tbuser where userid='$id'");    if (mysql_fetch_array($isexists)) {     $sql0 = mysql_query("update tbuser set username='$name',userpwd='$pwd' where userid= $id");     if ($sql0) {      return "ture | update ok";     } else {      return "false | 更新失敗";     }    } else {     return "false | usrid=$id not exists.";    }   } else {    return "false |id=$id name=$name and pwd=$pwd .At least one of them is null.";   }  } else {   return "false | $id is not type of int.";  } }}?>

與登入無關，只為了記錄一下PHP如何在資料庫MYSQL上實現CURD操作.

以上就是告訴了大家PHP如何通過AJAX方式實現登入功能，希望對大家的學習有所協助。

