Comprehensive understanding of PHP and database knowledge

With the continuous development of the Internet, the software industry is also growing. PHP language and database technology, as two important aspects that are essential to the software industry, have received more and more attention. This article will provide a comprehensive and in-depth introduction to the knowledge of PHP and databases, aiming to help readers better understand the concepts of the two, their respective characteristics, and their relationship with each other.

1. Concepts and characteristics of PHP

PHP (PHP: Hypertext Preprocessor) is a general open source scripting language designed to create dynamic pages and interactive functions for Web applications. The PHP language was first developed by Rasmus Lerdorf in 1994 and has now become one of the standard languages ​​for web development. Compared with other programming languages, PHP has the following characteristics:

1. Cross-platform

PHP is a cross-platform language that can run under various operating systems, including Windows , Linux, Unix and other operating systems.

2. Open source and free

PHP is an open source language. Users can freely download and use PHP without paying any fees.

3. Easy to learn

PHP syntax is relatively simple, easy to learn and master, the learning threshold is low, and it is suitable for beginners to get started.

4. Efficiency

PHP uses an engine called Zend Engine, which can quickly parse code and greatly improve development efficiency.

2. The concept and characteristics of database

A database is a software used to store and manage data. Database technology plays an important role in Internet applications, enterprise management information systems, Internet of Things, big data and other fields. Different from the file system, the database can provide more standardized and efficient data management and query, and has the following characteristics:

1. Strong data sharing

The database stores a large amount of data, different Programs can share data through databases to improve the efficiency of data management.

2. Data independence

Using a database can separate data from programs, isolate the storage and use of data, reduce the coupling between programs and data, and make the program have better performance maintainability.

3. High data security

The database can access and manage data through a series of authorization mechanisms to ensure data security.

4. Improved data reliability

Transactions can be used in the database to ensure data consistency and reliability.

3. The relationship between PHP and database

In web application development, PHP and database are closely integrated, and PHP can be used to drive operations such as storage, query, and update of the database. PHP provides a wealth of extension libraries for different types of databases, such as MySQL, Oracle, SQLServer and MongoDB, etc., which can interact with different types of databases. Specifically, PHP can interact with the database in the following ways:

1. Using raw SQL statements

PHP provides a series of functions for executing raw SQL statements , such as mysqli_query(), mysql_query(), etc. Through these functions, you can directly send SQL statements to the database to implement operations such as creating data tables, inserting data, querying, updating, and deleting data.

2. Using PDO

PHP Data Object (PDO) is a unified interface for operating databases provided by PHP, which can be used to connect to multiple types of databases, including MySQL , Oracle and SQL Server and other common databases to achieve rapid development of databases.

3. Using the ORM framework

The ORM (Object Relational Mapping) framework is a method of mapping data from a relational database to objects, integrating entities in the program with the database Corresponding to the tables in , the data access layer is separated from the business logic layer. There are many choices for PHP's ORM framework, such as Doctrine, Laravel, etc., which can make program development simpler and more efficient.

Conclusion

Through the introduction of this article, readers should have a certain understanding and mastery of the concepts, characteristics and correlations between PHP and databases. PHP language and database technology, as two core areas of Internet development, will play an increasingly important role in future development. Learning and mastering this knowledge will be directly related to our development and future in the software industry.

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