您的位置 首页 php

PHP登录功能如何编写

本篇文章主要介绍PHP登录功能如何编写,感兴趣的朋友参考下,希望对大家有所帮助。

具体代码如下:

1 login.php

登录界面中,javascript脚本用ajax方式异步请求dologin.php,dologin.php负责用户信息验证(包括验证码,php生成验证码可以自行搜索).登录界面的代码如下:

<?php session_start();?>

<!DOCTYPE html>

<html>

<head>

<meta http-equiv=”Content-Type” content=”text/html; charset=gb2312″ />

<title>login</title>

<link rel=”stylesheet” type=”text/css” href=”CSS/login.css” />

<script src=”JS/ajaxhelper.js” type=”text/javascript”></script>

<script src=”JS/jquery-1.3.2.min.js” type=”text/javascript”></script>

<script type=”text/javascript”>

function chkForm() {

if (m$(‘username’).value == “”) {

alert(‘用户名不能为空.’);

m$(‘username’).focus();

return false;

}

if (m$(‘password’).value == “”) {

alert(‘密码不能为空.’);

m$(‘password’).focus();

return false;

}

if (m$(‘password’).value != “” && m$(‘username’).value != “”) {

var xmlhttp = createRequest();

if (xmlhttp) {

m$(‘loading’).innerHTML = “<font color=’red’>loading…</font>”;

var username = m$(‘username’).value;

var pwd = m$(‘password’).value;

var code = m$(‘txtCode’).value;

var url = “dologin.php”;

xmlhttp.open(“POST”, url, true);

xmlhttp.onreadystatechange = ValidateResult;

xmlhttp.setRequestHeader(“Content-Type”, “application/x-www-form-urlencoded”);

xmlhttp.send(“username=” + escape (username) + “&password=” + escape(pwd) + “&code=” + escape(code));

} else {

alert(‘xmlHttp创建失败.’);

}

function ValidateResult() {

if (xmlhttp.readyState == 4) {

if (xmlhttp.status == 200) {

if (xmlhttp.responseText != “”) {

//window.alert(xmlhttp.responseText);

var obj = eval(“(” + xmlhttp.responseText + “)”);

if (obj.result == true) {

alert(“提示:” + obj.info);

window.location = ‘index.php’;

} else {

alert(“错误:” + obj.info);

}

} else {

window.alert(“从服务器获取失败”);

window.location.reload();

}

m$(‘loading’).innerHTML = “”;

}

}

}

}

}

function m$(id) {

return document.getElementById(id);

}

function changeCode() {

var xmlhttp = createRequest();

if (xmlhttp) {

m$(‘loading’).innerHTML = “<font color=’red’>loading…</font>”;

var dt = new Date().getTime();

// alert(dt);

var url = “function/imagecode.php?dummay” + escape(dt);

xmlhttp.open(“GET”, url, true);

xmlhttp.onreadystatechange = ValidateResult;

xmlhttp.send(null);

} else {

alert(‘xmlHttp创建失败.’);

}

function ValidateResult() {

if (xmlhttp.readyState == 4) {

if (xmlhttp.status == 200) {

var dt = new Date().getTime();

var url = “function/imagecode.php?dummay” + escape(dt);

m$(‘imgCode’).src = “function/imagecode.php?dummay” + escape(dt);

m$(‘loading’).innerHTML = “”;

}

}

}

}

function showTool() {

$(‘#pToolTip’).css(“display”, “block”);

}

function hideTool() {

$(‘#pToolTip’).css(“display”, “none”);

}

window.onload = initPage;

function initPage() {

$(‘#pToolTip’).css(“display”, “none”);

}

</script>

</head>

<body>

<p style=”background-color:#2A3F55; height:80px;”>

</p>

<p style=”min-height:500px;”>

<p class=”left”>

<p style=”margin:120px auto auto auto; height:300px; text-align:left”>

<p style=”font-size:26px;color:#2A3F55; text-align:center;”>Ajax PHP Demo System

<img src=”Images/appstorm-icon.png” alt=”appcation storm image” style=”position:relative;top:-18px; left:-12px; vertical-align:middle; text-align:center;font-size:10px; width:65px; height:46px;”/>

</p>

<br/>

<hr style=”border:dashed thin #2A3F55;width:70%; text-align:center;”/>

<p style=”font-size:13px;color:#999999; margin:20px auto 0 auto; padding-left:200px;”>

Author:<a href=”#” onmousemove=”showTool();” onmouseout=”hideTool();”>wangming</a>

</p>

<p style=”font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;”>DateTime:2009-9-1</p>

<p style=”font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;”>Version:1.0.0</p>

<p style=”font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;”>Email:wangmingemail@163.com </p>

<p id=”pToolTip”>

<img src=”Images/ming.jpg” height=”86px;”/>

<span class=”authordes”>

<br/>

姓名:wangming<br/>

电商06-2<br/>

</span>

</p>

</p>

</p>

<p class=”right”>

<form>

<br/>

<table class=”flogin”>

<tr>

< td >用户名:</td>

<td><input type=”text” name=”username” id=”username”/></td>

<td></td>

</tr>

<tr>

<td>密 码:</td>

<td><input type=”password” name=”password” id=”password” /></td>

<td></td>

</tr>

<tr>

<td>验证码:</td>

<td>

<input type=”text” name=”txtCode” id=”txtCode” size=”12″ />

<img src=”function/imagecode.php” id=”imgCode” alt=”image code” height=”22px;” style=” vertical-align:bottom;”/>

</td>

<td><input type=”button” class=”btnrefresh” onclick=”changeCode();” /></td>

</tr>

<tr>

<td></td>

<td><input type=”button” class=”btnlogin” onclick=”chkForm();” /></td>

<td></td>

</tr>

<tr>

<td></td>

<td><span id=”loading”></span></td>

<td><span id=”code”></span></td>

</tr>

</table>

</form>

</p>

</p>

<p style=”background-color:#2A3F55; height:60px; margin:auto 0 0 0; clear:both; text-align:center; line-height:60px; color:#FFFFFF;font-size:12px;”>

©Copyright 2015.

</p>

</body>

</html>

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”);//防止返回的中文乱码

$name=$_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’:’登陆成功!’,’code’:'”.$_SESSION[“code”].”‘}”;

echo “{‘result’:true,’info’:’登陆成功!’}”;

}

else

{

echo “{‘result’:false,’info’:’密码错误!’}”;

}

}

else

{

echo “{‘result’:false,’info’:’该用户不存在!’}”;

}

}

else

{

echo “{‘result’:false,’info’:’验证码错误!’}”;

}

?>

4 conn.php

<?php

$conn=$mysql_connect(” localhost “,”root”, “”);

mysql_select_db(“bbs”,$conn);

mysql_query(“SET NAMES GB2312”);

?>

5

<?php

class 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 | 删除失败”;

}

} else {

return “false | 删除失败 $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 | 更新失败”;

}

} 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.”;

}

}

}

?>

总结:以上就是本篇文的全部内容,希望能对大家的学习有所帮助。

相关推荐:

php 无限分类 树形数据格式化代码实例详解

PHP从二维数组得到N层分类树的实现方法

php fseek实现函数读取大文件的两种方法

以上就是PHP登录功能如何编写的详细内容,更多请关注其它相关文章!

更多技巧请《转发 + 关注》哦!

文章来源:智云一二三科技

文章标题:PHP登录功能如何编写

文章地址:https://www.zhihuclub.com/76814.shtml

关于作者: 智云科技

热门文章

网站地图