What are the core functions of php language

PHP is an open source scripting language that is easy to learn and widely used. It is mainly suitable for web development.

Compared with other programming languages, PHP embeds programs into HTML documents for execution and has high execution efficiency. (Recommended learning: PHP video tutorial)

The execution environment of PHP is mainly on the server port and has 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 mainly relies on the form

in html. to fulfill.

The information passed 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().

Another main core function of PHP is connection, operation, and database.

This is mainly achieved through the functions mysql_connent(), mysql_query(), mysql_select_db(), mysql_close().

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.

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