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What is the use of PHP Stream Wrappers skills, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

The concept of Streams, introduced in php4.3, is an abstraction of streaming data, which is used to unify data operations, such as file data, network data, compressed data, and so on. To put it simply, a stream is a resource object that shows the behavior of streaming data.

Understand the flow in IT

When there is data interaction between different media, stream is used to implement it. Data sources and targets can be files, TCP/IP or UDP network connections, standard input and output, file transfer on file servers, or file archiving processes. Even though these streams seem to be very different from each other, they have a common thread: they are basically read-write processes. You can write data from the source to the destination, or you can transfer data read from the source to the destination. The general process is as follows:

Connection establishment

Data reading

Data writing

End of connection

Even if the basic operation is read and write, other actions are required to access the Web server or archive files, or to perform simple input and output procedures, and to establish connections through TCP/IP or UDP.

General functions in stream operation

We can interact with the flow through some common functions in PHP:

Fileopenfwritefclosefile_get_contentsfile_put_contents

In PHP, you can use general functions to perform various flow operations without having to use separate functions, making the whole process easier.

To this day, these functions are still a major part of the flow concept and are used in the file reading and writing process. We can now use wrapper (wrapper) in PHP to perform various stream processing, such as HTTP,FTP,SOCKET processes and standard input / output processes.

If you want to use a stream, you need to specify its type and destination in a specific format. The flow type we will use in the general function is defined as follows:

: / /

Placeholders are used to specify the type of stream we will use, such as File,FTP,PHPOUTPUT,PHPINPUT,HTTP or SSL.

If you are a PHP programmer, you should be familiar with the following code. It reads the some.txt file and prints its contents.

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