PHP课堂--实验4
PHP课堂--实验4
实验目的:
掌握PHP中函数的基本应用,注意参数传递过程中传值和传引用的区别
掌握PHP中表单的基本应用,包括get和post两种方式,注意这两种方式的区别
掌握PHP中文件的打开,关闭和上传操作
掌握PHP中cookie和session的基本使用
实验内容:
1.编写一个php动态页面,在html标记中用先嵌入一段php代码,给变量$x赋一个文本数值;然后把$x的数值作为一个html表单中的文本型输入框的value属性值。
提示:
使用:
2、使用form进行不同页面动态交互(两种不同方式,get和post的区别,)
建立前后2个页面,通过使用form和sumbit按钮来实现:将前一页输入框中的值提交给后一页进行显示。
提示:
1)前页:
页面跳转:
提交按钮:
2)后页:
显示前一页传来的参数的方法:
3、使用form进行相同页面动态交互。
使用循环将用户输入的4个数由小到大排序显示。
提示:
本页的动态交互:不需要action,直接:
假设我们的提交按钮是:
则通过$_POST[“bt1”]可获得页面的提交情况:
if(isSet($_POST["bt1"]))//已点击了提交按钮,此值=真,否则为假。
4、文件上传
提示:
创建一个文件上传表单,注意enctype="multipart/form-data">(表示表单需要二进制数据);
进行文件上传的操作,注意$_FILES变量和参数的使用,文件上传过程中先把文件存放在服务器的临时目录,$_FILES[“file”][“tmp_name”],然后再利用move_uploaded_file()拷贝到指定目录;
提高要求,在文件上传过程中,对于文件类型,文件大小进行限制,如只允许小于100k的文件。
5.按照课件上面的cookie和session例子,了解cookie和session的基本用法
1、源代码:exam4_1.php
<?php $x = "Hello world!!!"; ?>1.编写一个php动态页面,在html标记中用先嵌入一段php代码,给变量$x赋一个文本数值;然后把$x的数值作为一个html表单中的文本型输入框的value属性值。<input type="text" name="x" size="32" value="<?php echo $x;?>">
2.源代码:exam4_2.php

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

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.

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.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

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 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.


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