What is cURL?

First of all, I am gonna talk about what cURL is then I will tell you what it does.
cURL is an extension in PHP which allows your PHP server to access other websites, sending and receiving information via a URL-like protocol. (You'll most commonly use HTTP, which lets you talk to other web pages, and FTP, which allows you to upload and download files.) In practical terms, this means you can have your server imitate a web browser, go to other sites, and download their web pages into a variable of your choosing.

cURL is a vital tool for any serious online shopping cart, because it allows you to approve credit card charges and get live shipping quotes for customers. You use cURL to connect and send transaction data to another company's server. The server replies, telling you information such as whether the charge was approved or denied and why.

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