Summary of experience in PHP development

Before doing it, you must first clarify your goals, understand what functions you want to achieve, and then design the front-end page based on the functions.

Before making the layout of the page, you can draw a rough pattern on paper and then write it.

When all required pages are completed, write PHP code to implement the function.

The functions should be done one by one, and after completing one, do the next one. The principle of writing code is that on the premise of functional realization, the simpler the code, the better.

The reference to the path must be correct, otherwise the reference will not be successful.

Continuing Learning
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<?php session_start(); header("content-type:text/html;charset=utf-8"); //连接数据库 $link = mysqli_connect("localhost","root","root","regedit"); if (!$link) { die("连接失败: " . mysqli_connect_error()); } if(isset($_POST)){ //用户名不能为空 if(!$_POST['username']){ echo('用户名不能为空'); return; } //密码不能为空 if(!$_POST['password']){ echo('密码不能为空'); return; } //判断验证码是否填写并且是否正确 if(!$_POST['code']){ echo('验证码不能为空'); return; }else if($_POST['code']!=$_SESSION['VCODE']){ echo('验证码不正确'); return; } $sql="select username,password from form where username = '{$_POST['username']}' and password='{$_POST['password']}'"; $rs=mysqli_query($link,$sql); //执行sql查询 $row=mysqli_fetch_assoc($rs); if($row) { // 用户存在; if ($username == $row['username'] && $pwd == $row['password']) { //对密码进行判断。 echo "登陆成功,正在为你跳转至后台页面"; //header("location:index.php"); } }else{ echo "账号或密码错误" . "<br/>"; echo "<a href='login.html'>返回登陆页面</a>"; } }
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