What is the main function of php language

1. PHP is an open source scripting language, which is easy to learn and widely used. It is mainly suitable for the field of Web development

2 . Compared with other programming languages, dynamic pages made with PHP embed the program into the HTML document for execution, and the execution efficiency is high.

3. PHP The execution environment is mainly on the server port and mainly consists of two core functions. The first one is the exchange of information with the client browser. Not only can information be sent from the server to the client browser, but also client information can be sent to the server. This is mainly achieved by relying on the form

in HTML. The transferred information can be obtained through PHP built-in functions $_POST(), $_GET(), $_REQUEST(). Through the html form, the client's file can also be passed to the client, which is achieved through PHP's built-in functions $_FILE() and move_uploaded_file()

4, PHP another The main core functions are connection, operation, and database. This is mainly achieved through the functions mysql_connent(), mysql_query(), mysql_select_db(), mysql_close()

##5. Due to the continuous development of PHP, in addition to the above method, there are also The database can be connected and manipulated through MySqli extension and PDO extension

Note:

The development of the website is mainly developed with the help of PHP Frameworks, currently more popular ones include thinkphp, Yii, Lavarel and other frameworks. The operations of these frameworks on the database are encapsulated in classes. Through development documents, you can find the objects created by these classes, the operations of the corresponding objects, and the code for connecting and manipulating the database.

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