PHP实现注册登录功能完整教程及代码 （含验证码） 只是为实现功能，所以页面并没有美化，本教程包含注册登录功能的完整流程及代码： 文件列表如图：
注册html代码：
<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><link rel="stylesheet" type="text/css" href="css/register.css" /><title>注册界面</title></head><body> <span style="white-space:pre"></span> <form name="form1" method="post" action="add.php"><span style="white-space:pre"></span> <div><span style="white-space:pre"></span> <ul><span style="white-space:pre"></span> <li><input name="nickname" type="text" placeholder ="昵称：数字、字母、下划线"/></li><span style="white-space:pre"></span> <li><input name="studentid" type="text" placeholder ="学号：9位纯数字"/></li><span style="white-space:pre"></span> <li><input name="password" type="password" placeholder ="密码：至少6位"/></li><span style="white-space:pre"></span> <li><input name="confirm" type="password" placeholder ="确认密码"/></li><span style="white-space:pre"></span> <li><input name="emailaddress" type="text" placeholder ="常用邮箱"/></li><span style="white-space:pre"></span> <li><input name="verification" type="text" placeholder ="输入验证码"/></li><span style="white-space:pre"></span> </ul><span style="white-space:pre"></span> <div id="text11"><img name="validate" οnclick="validate.src+='?' + Math.random();"<span style="white-space:pre"></span> src="verification.php" alt="点击刷新"><span style="white-space:pre"></span> </div><span style="white-space:pre"></span> <span style="white-space:pre"></span> <input type="reset" value="重置" /><span style="white-space:pre"></span> <input type="submit" value="确定" /> <span style="white-space:pre"></span> </div><span style="white-space:pre"></span> <span style="white-space:pre"></span> </form><span style="white-space:pre"></span> </div></body></html>
效果图如下：
可以看出生成了验证码，且验证码可以点击刷新，刷新页面时也可以刷新 验证码文件verification.php：
<?phpsession_start();$img = imagecreatetruecolor(100, 35);$black = imagecolorallocate($img, 0x00, 0x00, 0x00);$green = imagecolorallocate($img, 0x00, 0xFF, 0x00);$white = imagecolorallocate($img, 0xFF, 0xFF, 0xFF);imagefill($img,0,0,$white);//生成随机的验证码$code = '';for($i = 0; $i < 4; $i++) {$code .= rand(0, 9);}$_SESSION['rand'] = $code; //存储验证码imagestring($img, 30, 28, 10, $code, $black);//加入噪点干扰for($i=0;$i<200;$i++) {imagesetpixel($img, rand(0, 100) , rand(0, 100) , $black); imagesetpixel($img, rand(0, 100) , rand(0, 100) , $green);}//输出验证码header("content-type: image/png");imagepng($img);imagedestroy($img);?>
生成4位随机数字并加入噪点干扰，防止机器识别。并用session存储生成的数字，用于后边验证。
php代码通过接收前台数据进行验证 先写php的配置文件代码：
<?phpheader ("Content-type:text/html;charset=utf8_bin");define('HOST','127.0.0.1');define('USERNAME','root');define('PASSWORD','root');//连库$con=mysql_connect(HOST,USERNAME,PASSWORD);//选库mysql_select_db('rrf');//字符集mysql_query('set names utf8_bin');?>
根据本机的数据库密码进行配置 命名为connect.php
<?php//把传递过来的信息入库；session_start();//用于核对验证码require_once('connect.php');// print_r($_POST);$nickname=$_POST["nickname"];$studentid=$_POST['studentid'];$password=$_POST['password'];$confirm=$_POST['confirm'];$emailaddress=$_POST['emailaddress'];$verification=$_POST["verification"];$sql="select * from student_information where studentid = '$studentid'";$today=date('Y-m-d H:i:s');//获取时间作为注册时间$query=mysql_query($sql);$rows=mysql_num_rows($query);//验证填写信息是否合乎规范if(empty($nickname)||empty($studentid)||empty($password)||empty($confirm)||empty($emailaddress)||empty($emailaddress)) {echo "<script>alert('信息不能为空！重新填写');window.location.href='register.html'</script>";}elseif ((strlen($nickname) < 4)||(!preg_match('/^\w+$/i', $nickname))) {echo "<script>alert('用户名至少4位且不含非法字符！重新填写');window.location.href='register.html'</script>";//判断用户名长度}elseif ((strlen($studentid)!=9)||(!(ctype_digit($studentid)))){echo "<script>alert('学号为9位纯数字！重新填写');window.location.href='register.html'</script>";//判断学号是否填写正确}elseif( $rows > 0){echo "<script>alert('此学号已经注册！重新填写');window.location.href='register.html'</script>";//学号不能重复}elseif(strlen($password) < 6){echo "<script>alert('密码至少6位！重新填写');window.location.href='register.html'</script>";//判断密码长度}elseif($password!=$confirm){echo "<script>alert('两次密码不相同！重新填写');window.location.href='register.html'</script>";//检测两次输入密码是否相同}elseif (!preg_match('/^[\w\.]+@\w+\.\w+$/i', $emailaddress)) {echo "<script>alert('邮箱不合法！重新填写');window.location.href='register.html'</script>";//判断邮箱格式是否合法}//elseif($verification !=$_SESSION['$code']) {elseif(($_SESSION['rand'])!=($verification )){echo "<script>alert('验证码错误！重新填写');window.location.href='register.html'</script>";//判断验证码是否填写正确} else{$insertsql= "insert into student_information(nickname,studentid,password,confirm,emailaddress,registrationtime,logintime)values('$nickname','$studentid','$password','$confirm','$emailaddress','$today','$today')";//插入数据库if(!(mysql_query($insertsql))){echo mysql_error();}else{echo "<script>alert('注册成功！去登陆');window.location.href='login.html'</script>";}} ?>
session主要用来核对验证码，在验证码文件里用session存储验证码数字，在这里核对是否填写正确。 require 包含配置链接文件 post接收数据，并存储在变量中。
用正则表达式验证填写的信息是否合乎规范以及是否已经存在用户，若所有信息核对无误，写入数据库 注释已经很清楚，不做赘述
登录界面代码login.html：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head><title>登陆</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head><form action="login.php" method="post"><div><ul><li><input name="nickname" type="text" placeholder ="昵称"/></li><li><input name="studentid" type="text" placeholder ="学号"/></li><li><input name="password" type="password" placeholder ="密码"/></li><li><input name="verification" type="text" placeholder ="验证码"/></li><input name="reset" type="reset" value="重置"/><input name="submit" type="button" value="登录"/></ul><div id="text11"><img name="validate" οnclick="validate.src+='?' + Math.random();"src="verification.php" alt="点击刷新"></div></div></form></body></html>
效果图如下：
验证码效果和上边相同，不做赘述 接下来是登录验证php代码（login.php）：
<?phpsession_start();require_once('connect.php');//连接数据库$nickname=$_POST['nickname'];$password=$_POST['password'];$verification=$_POST['verification'];$studentid=$_POST['studentid'];$today=date('Y-m-d H:i:s');//获取时间作为本次登录时间$ip=$_SERVER["REMOTE_ADDR"];//获取登陆IP地址$sql="select * from student_information where nickname='{$nickname}' and password='{$password}' ";$rst=mysql_query($sql);$row=mysql_fetch_assoc($rst);//验证登录信息是否正确if(($_SESSION['rand'])!=($verification )){echo "<script>alert('验证码错误！重新填写');window.location.href='login.html'</script>";//判断验证码是否填写正确 }elseif($row) { setcookie('niacname',$nickname,time()+10,'/');setcookie('studentid',$studentid,time()+10,'/'); $up="UPDATE student_information SET logintime='$today' WHERE studentid='$studentid'";$ip="UPDATE student_information SET ip='$ip' WHERE studentid='$studentid'";if (mysql_query($up)){}if (mysql_query($ip)){}//更新登录时间及ipecho "<script>alert('登陆成功！欢迎');window.location.href='content.php'</script>";}else{echo "<script>alert('登陆信息有误！重新填写');window.location.href='login.html'</script>"; }?>
详细代码文件压缩包已上传 至我的资源 点击下载完整教程及代码包
如果觉得《PHP实现注册登录功能完整教程及代码 含验证码》对你有帮助，请点赞、收藏，并留下你的观点哦！
