Using the PHP Function Curl_Multi_String()

Functions in PHP are the building blocks of code that can be called to perform a set of actions on multiple items or locations. They are a powerful tool for reducing the amount of code needed to get the job done. There are many built-in functions that come from the standard distribution and extensions compiled with PHP, as well as ones that you can create yourself.

Almost all functions in the "easy" interface return a CURLcode error string, which often offers more detailed information about what went wrong than just the error number alone. You can call curl_easy_strerror() to retrieve such an error string from a specific CURLcode number.

This return code is returned if libcurl tried to parse a 227 line as part of a PASV or EPSV command on an FTP server and the server failed to produce a valid response to that request. This is an internal error, not related to the user's authentication status.

Using the libcurl library in PHP is a great way to work with servers and transfer data between them. It has a wide variety of uses and works with different protocols like HTTP, HTTPS, FTP, SFTP, and FTPS.

To use cURL in your own code, first you need to learn how it works. The best place to start is by learning the built-in functions that PHP already provides, as well as some of the common problems you might run into while working with it. Then, once you've got a good understanding of how the language works, you can create your own functions that can help you solve specific problems.