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CURL library in PHP

CURL library in PHP

Today we will talk about such a tool as cURL PHP. Here you can get acquainted with the principle of work and with various examples. We hope we will be able to answer all your questions on this topic.

 

cURL Technology

cURL is a special technology that is used by users to transmit and receive various data through interaction with a URL. We would like to highlight that cURL perfectly supports various popular protocols, among which are HTTP, FTP, and so on.

In general, cURL used to be just a command-line tool. But everything changed when the PHP developers decided to create a whole separate library in PHP, and this greatly facilitated the work and life of many programmers.

How cURL works

When using cURL queries, remember that there are 4 basic and important steps that simply must take their position in your script. And what are those steps?

  • Initialization of your data.
  • Specify parameters.
  • Execute and verify, then get the result.
  • Freeing up memory.

Remember! In the absence of at least one of these steps, the script is doomed to complete failure.

Let's now take a closer look at each of the points:

Initialization

Use here the code $ch = curl_init ( );

Specify parameters that include URLs

curl_setopt($ch, CURLOPT_URL, » «);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);

The result is getting HTML

$output = curl_exec($ch);

The last and final step is to close the connection

curl_close($ch);

Thus, let's structure what has been studied, and somewhere we will pay attention to new things:

curl_setopt is used to set a parameter for a single cURL session.

opinion is a parameter to set that belongs to the CURLORT_XXX.

value is the value that is inherent in the above opinion parameter.

POST and GET requests

 

A GET request is considered easier, it can be quickly entered immediately in the browser, but working with POST is a little longer and more complicated. Of course, to work with it, a great many programs were invented, constantly competing with each other with the convenience and simplicity of their interface.

 

However, as is often the case, they will not always be at your fingertips. But we need to work. What to do in such a situation? It will be much easier for you to use the terminal, then enter a command in it and instantly display the result.

And of course, keep a few simple and common examples of these CURL queries.

Case of using CURL POST request

curl -X POST http://127.0.0.1/page

Case of using a CURL GET request

curl -X GET http://127.0.0.1/page

Theory is a wonderful thing, but it will bring much more benefit if it is fixed by practice. That is why we advise not to postpone, but immediately go and practice. We wish you great success in programming!