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Main core functions of PHP language
1. Information exchange with client browser
PHP language can not only send information from the server to the client browser, but also send client information to the server. This mainly relies 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().
2. Another main core function of PHP is connection, operation, and database
This is mainly through the functions mysql_connent(), mysql_query(), mysql_select_db(), mysql_close( )accomplish.
3. Due to the continuous development of PHP, in addition to the above method, the database can also be connected and manipulated through MySqli extension and PDO extension
Note ：
Website development mainly relies on PHP development framework, and the more popular frameworks are thinkphp, Yii, Lavarel and so on. 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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