[PHP] Practical functions 8_PHP tutorial
//Create dBase data table
int dBase_create(string filename,array fields)
//Open dBase data table
int dbase_open(string filename,int flags)
// Close the dBase data table
boolean dbase_close(int dbase_identifier)
//Clean up the dBase data table
bool dbase_pack(int dbase_identifier)
//Add records to the dBase data table
bool dbase_add_record(int dbase_identifier,array record)
//Delete the record of the dBase data table
bool dbase_delete_record(int dbase_identifier,int record)
//Get the record of the dBase data table
array dbase_get_record(int dbase_identifier,int record)
//Get the number of fields in the dBase data table
int dbase_numfields(int dbase_identifier)
//Get the records of the dBase data table Number
int_dbase_numrecords(int dbase_identifier)
//Open the directory and return a dir_handle
int opendir(string path)
//Close the directory connection marked by dir_handle
void closedir(int dir_handle)
//Change the current working directory
int chdir(string directory)
//Get the current working directory
string getcwd(void)
//Wrap dir_handle to the beginning
vod rewinddir(int dir_handle)
//Read directories one by one from dir_handle
string readdir(int dir_handle)
/ /Get the free disk space of the file system where path is located, in bytes
double diskfreespace(string directory)
//Change the owner of the file
bool chown(string filename, mixed user)
//Change the group attributes of the file
bool chgrp(string filename,mixed group)
//Change the file attributes
bool chmdo(string filename,int mode )
//Set the modification time of the file
bool touch(string filename,int [time])
//Get file access permission (returned in octal form)
int fileperms(string filename)
//Get the i-node (index node) information of the file
int filenode(string filename)
//Get the file size
int filesize( string filename)
//Get the UID value of the file
int fileowner(string filename)
//Get the GID value of the file
int filegroup(string filename)
//Get the file type. Possible return types include fifo, char, dir, block, link, file and unknown.
string filetype(string filename)
//If the file meets the attributes specified by xxx, then returns true. xxx is dir, executable, file, link, readable, writeable, etc.
bool is_xxx(string filename)

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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