Backend Development
PHP Tutorial
Detailed example of how to judge user operation permissions through Session
Detailed example of how to judge user operation permissions through Session
In most website development processes, it is more practical to divide the permissions of administrators and ordinary users to operate the website. Let's give a comprehensive explanation through a specific code example. To give friends a more intuitive experience, you can combine the knowledge you have learned previously to improve your code and ideas.
First, verify the user's authority to operate the website through the user information submitted on the user login page.
The specific development steps are as follows:
(1) Design a login page, add a form, use POST method to transfer parameters, the data processing page pointed to by action is default.php , add a username text box and name it user, add a password field text box and name it pwd, and perform a submission jump through the submit button. The main code is as follows.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script type="text/javascript">
function check(form){
if(form.uesr.value == ""){
alert("请输入用户名");
}
if(form.pwd.value == ""){
alert("请输入密码");
}
form.submit();
}
</script>
</head>
<body>
<form name="form1" method="post" action="default.php">
<table width="520" height="390" border="0" cellpadding="0" cellspacing="0">
<tr>
<td valign="top">
<table width="520" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="24" align="right">用户名：</td>
<td height="24" align="left">
<input name="user" type="text" id="user" size="20">
</td>
</tr>
<tr>
<td height="24" align="right">密 码：</td>
<td height="24" align="left">
<input name="pwd" type="password" id="pwd" size="20">
</td>
</tr>
<tr align="center">
<td height="24" colspan="2">
<input name="submit" type="submit" value="提交" onclick="return check(form);">
<input type="reset" name="reset" value="重置">
</td>
</tr>
<tr>
<td height="76">
<span>超级用户: admin 密 码：111 </span>
<br><br>
<span>普通用户: tom 密 码：000 </span>
</td>
</tr>
</table>
</td>
</tr>
</table>
</form>
</body>
</html>(2) Under the click event of the "Submit" button, call the custom function check() to verify whether the form element is empty. The javascript code is used here for verification. Please supplement your knowledge about javascript by yourself. The custom function check() code is as follows:
<script type="text/javascript">
function check(form){
if(form.uesr.value == ""){
alert("请输入用户名");
}
if(form.pwd.value == ""){
alert("请输入密码");
}
form.submit();
}
</script>(3) Submit the form elements to the data processing page default.php. First use the session_start() function to initialize the session variable, then use the POST method to receive the value of the form element, and assign the obtained user name and password to the session variable respectively. The code is as follows:
<?php session_start(); $_SESSION['user']=$_POST['user']; $_SESSION['pwd']=$_POST['pwd']; ?>
(4) To prevent Other users illegally log in to the system and use if conditional statements to judge the value of the session variable. The knowledge of javascript is continued here. The code is as follows:
<?php
if($_SESSION['user']==""){
echo '<script type="text/javascript">alert("请使用正确途径登录"); history.back();</script>';
}
?>(5) In the data processing page default.php Add the following navigation bar code to determine the level of the current user to see whether the logged-in user is an administrator or an ordinary user, and then the differentiated output is displayed:
<table align="center" cellpadding="0" cellspacing="0">
<tr align="center" valign="middle">
<td style="width: 140px; color: red;">当前用户：
<!-- 输出当前登录用户级别-->
<?php
if($_SESSION['user']=="admin"&&$_SESSION['pwd']=="111"){
echo "管理员";
}else{
echo "普通用户";
}
?>
</td>
<td width="70"><a href="default.php">首页</a><td>
<td width="70">|<a href="default.php">文章</a><td>
<td width="70">|<a href="default.php">相册</a><td>
<td width="100">|<a href="default.php">修改密码</a><td>
<?php
if($_SESSION['user']=="admin"&& $_SESSION['pwd']=="111") { //如果当前用户是管理员
//如果当前用户是管理员 则输出 用户管理
echo '<td width="100">|<a href="default.php">用户管理</a><td>';
}
?>
<td width="100">|<a href="safe.php">注销用户</a><td>
</tr>
</table>(6) In the default.php page above Add the "Logout User" hyperlink page safe.php, and write the following code in safe.php to delete the user Session and return to the login page:
<?php
session_start(); //初始化 session
unset($_SESSION['user']); //删除用户名会话变量
unset($_SESSION['pwd']); //删除密码会话变量
session_destroy(); //删除当前所有会话变量
header("location:index.php"); //跳转到用户登录页
?>(7) Run this example on the website Enter your username and password on the user login page, log in to the website as a super user or log in as an ordinary user and run it.
php Chinese website learning topic: php session (including pictures, texts, videos, cases)
The above is the detailed content of Detailed example of how to judge user operation permissions through Session. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1672
14
1428
52
1332
25
1276
29
1256
24
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.
