PHP login session verification example

Interface:

<code><span><<span>html</span>></span><span><<span>head</span>></span><span><<span>title</span>></span>Login<span></<span>title</span>></span><span></<span>head</span>></span><span><<span>body</span>></span><span><<span>form</span><span>name</span>=<span>"fangbei"</span><span>method</span>=<span>"post"</span><span>action</span>=<span>"check_session_login.php"</span>></span><span><<span>div</span><span>style</span>=<span>"width:353"</span>></span><span><<span>dl</span>></span><span><<span>dt</span>></span><span></<span>dt</span>></span><span><<span>dd</span>></span><span><<span>div</span><span>align</span>=<span>"left"</span>></span>
       Username:
       <span><<span>input</span><span>type</span>=<span>"text"</span><span>name</span>=<span>"username"</span> /></span><span></<span>div</span>></span><span></<span>dd</span>></span><span><<span>dd</span>></span><span><<span>div</span><span>align</span>=<span>"left"</span>></span>
       Password : 
       <span><<span>input</span><span>type</span>=<span>"password"</span><span>name</span>=<span>"pwd"</span> /></span><span></<span>div</span>></span><span></<span>dd</span>></span><span><<span>dd</span>></span><span><<span>p</span><span>align</span>=<span>"center"</span>></span><span><<span>input</span><span>type</span>=<span>"submit"</span><span>name</span>=<span>"Submit"</span><span>value</span>=<span>"Submit"</span> /></span><span><<span>input</span><span>type</span>=<span>"reset"</span><span>name</span>=<span>"Reset"</span><span>value</span>=<span>"Reset"</span> /></span><span></<span>p</span>></span><span></<span>dd</span>></span><span></<span>dl</span>></span><span></<span>div</span>></span><span></<span>form</span>></span><span></<span>body</span>></span><span></<span>html</span>></span></code>

Database preparation:

username	pwd	userflag
perry	123	1

Login verification:

<code><span><span><?php</span>
header(<span>"Content-Type: text/html; charset=utf-8"</span>);
<span>$servername</span>=<span>"localhost"</span>;
<span>$username</span> = <span>"root"</span>;
<span>$password</span> = <span>""</span>;
<span>$dbname</span> = <span>"paul"</span>;
<span>$conn</span> = <span>new</span> mysqli(<span>$servername</span>, <span>$username</span>, <span>$password</span>, <span>$dbname</span>);
<span>if</span> (<span>$conn</span>->connect_error) {
    <span>die</span>(<span>"Connection failed: "</span> . <span>$conn</span>->connect_error);
}
<span>$conn</span>->query(<span>"SET NAMES utf8"</span>);
<span>//获取输入的信息</span><span>$username</span> = <span>$_POST</span>[<span>'username'</span>];
<span>$pwd</span> = <span>$_POST</span>[<span>'pwd'</span>];
<span>//获取session的值</span><span>$sql</span> = <span>"select username,userflag from test_login where username = '$username' and pwd = '$pwd'"</span>;
<span>$result</span> = <span>$conn</span>->query(<span>$sql</span>);
<span>//判断用户以及密码</span><span>if</span> (<span>$result</span>->num_rows > <span>0</span>) {

    session_start();
    <span>//判断权限</span><span>$row</span> = <span>$result</span>->fetch_assoc();
    <span>if</span>(<span>$row</span>[<span>'userflag'</span>] == <span>1</span><span>or</span><span>$row</span>[<span>'userflag'</span>] == <span>0</span>){
        <span>$_SESSION</span>[<span>'username'</span>] = <span>$row</span>[<span>'username'</span>];
        <span>$_SESSION</span>[<span>'userflag'</span>] = <span>$row</span>[<span>'userflag'</span>];
        <span>echo</span><span>"<a href='welcome_session_login.php'>欢迎访问</a>"</span>;
    }
    <span>else</span>{
        <span>echo</span><span>"迷之用户"</span>;
    }

}
<span>else</span>{
    <span>echo</span><span>"用户名或密码不正确"</span>;
}
</span></span></code>

Welcome interface:

<code><span><?php</span>
header(<span>"Content-Type: text/html; charset=utf-8"</span>);
session_start();
<span>if</span>(<span>isset</span>(<span>$_SESSION</span>[<span>'username'</span>]))
{
    <span>if</span>(<span>$_SESSION</span>[<span>'userflag'</span>] == <span>1</span>)
        <span>echo</span><span>"欢迎管理员"</span>.<span>$_SESSION</span>[<span>'username'</span>].<span>"登录"</span>;
    <span>if</span>(<span>$_SESSION</span>[<span>'userflag'</span>] == <span>0</span>)
        <span>echo</span><span>"欢迎用户"</span>.<span>$_SESSION</span>[<span>'username'</span>].<span>"登录"</span>;
}
<span>else</span>
{
    <span>echo</span><span>"登录已过期"</span>;
}
<span>unset</span>(<span>$_SESSION</span>[<span>'username'</span>]);
<span>unset</span>(<span>$_SESSION</span>[<span>'pwd'</span>]);
<span>unset</span>(<span>$_SESSION</span>[<span>'userflag'</span>]);
<span>echo</span><span>"<br>会话结束"</span>;</code>

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The above introduces the PHP login session verification example, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.