Integration of PHP with database optimization recommendations

Today, in the Internet field, PHP and database have become commonly used technologies among developers. The improvement of PHP and database not only means an improvement in performance, but also in terms of data security and data reliability. Therefore, this article will explore some optimization suggestions for PHP and databases to help developers improve the efficiency and quality of their actual work.

1. Optimization of PHP code

1. Try to avoid using global variables

Global variables refer to variables that can be accessed globally in the program context. Their values ​​may will be changed. Using global variables multiple times will lead to inefficiency in PHP scripts. Therefore, during the development process, you should try to avoid using global variables.

2. Use join to connect tables

When performing data query, it is often necessary to use JOIN to connect tables to associate data between different tables, but JOIN can consume part of the performance. If possible, use stored procedures or views to avoid JOIN operations.

3. Avoid disk I/O read and write times

When reading a large amount of data, disk I/O will become a bottleneck, so when designing the MySQL data table, try to avoid unnecessary Necessary read and write operations to reduce disk I/O times and improve PHP script efficiency.

4. Use cache acceleration

Cache is a very useful acceleration technology. When updated infrequently, caching can increase the page range and reduce the load on the server. Therefore, it is very important and effective to use caching in the right place.

2. Database optimization

1. Create optimized index

Index is an important factor in improving query efficiency in the database. It can quickly locate table data and reduce data retrieval. time. When designing data tables, you should try to use indexes, but at the same time, avoid creating too many indexes, because too many indexes will also reduce database efficiency.

2. Use partitioned tables

Partitioning is an optimization technology that can divide a large table into multiple small tables to reduce data retrieval time. At the same time, partition tables can also provide convenience in database maintenance and data backup.

3. Optimize query statements

When performing data queries, try to avoid using the SELECT * statement. When querying, you can use the LIMIT clause or return the query results in pages. In addition, when performing data queries, it is best to cache commonly used query statements to reduce the number of database operations.

4. Avoid using SubQuery

SubQuery refers to obtaining the result set through subquery, and then bringing the result set to the external query. When SubQuery is nested too much, the query efficiency will be greatly reduced. , in real applications, SubQuery should be avoided as much as possible.

5. Cache for common queries

When querying more frequent data, caching technology can be used for optimization. Common caching technologies include Redis, Memcached, etc. When using caching technology, you should pay attention to data changes and cache consistency issues.

3. Comprehensively consider security issues

In the development of Web applications, security issues are an essential part. Security issues are also a top priority when it comes to PHP and database development. Developers should guard against security issues such as SQL injection and XSS attacks.

1.SQL injection attack

SQL injection attack refers to a Web application that deceives the application and directly obtains database information by passing illegal parameters or entering illegal characters on the page. . Developers should use prepared statements to prevent SQL injection attacks.

2.XSS attack

XSS attack is an attack that exploits security vulnerabilities that often exist in web applications to run malicious scripts in the user's browser. Developers should use techniques such as escaping, input filtering, and output filtering to prevent XSS attacks.

In actual development work, optimization of PHP and database is an inevitable problem, and the optimization solutions listed in this article alone are far from enough. Developers should strengthen their practices in specific work, especially paying more attention to data security, so that the efficiency, stability and security of PHP and database programs can be improved.

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