How to add parameters to POST request in PHP using cURL

When using the cURL extension library in PHP to make HTTP requests, it is often necessary to add some parameters when submitting the request via POST. Because they can help us manage our parameters effectively, and fortunately they are very easy to add. In this article, we will explain how to add parameters to POST requests in PHP using cURL.

First, we need to ensure that the cURL extension library has been installed and enabled in the PHP environment. You can check whether the environment supports it through the phpinfo() function. If you have not installed cURL, please use the following command to install it:

sudo apt-get install curl

Next, we will use a simple example to demonstrate how to use cURL to add POST parameters. At this point, we need two files:

post_data.php:

<?php

$postdata = http_build_query(
    array(
        &#39;username&#39; => 'jack',
        'password' => 'xyz',
    )
);

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,"http://example.com/login");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);

// receive server response ...
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$result = curl_exec ($ch);

curl_close ($ch);

echo $result;

login.php:

<?php

$username = $_POST[&#39;username&#39;];
$password = $_POST[&#39;password&#39;];

echo "Username: ".$username."\n";
echo "Password: ".$password."\n";

Code Explanation:

postdata The array defines the key-value pairs to be added in the POST request. The http_build_query() function is used to serialize the array into a string, and use Prefix the attribute name, for example: username=jack&password=xyz.

The next step is to initialize cURL, set the requested URL address, set the request to a POST request, and set the POST data to postdata.

Process the server response and print the result, and finally close the cURL request.

The login.php file accepts POST requests and parses the data from the array and prints out the results.

If your POST data is an array, you can pass it to the http_build_query() function, which will parse each element in the array and build it into the appropriate request characters string.

For example:

$postdata = http_build_query(
    array(
        'my_array' => array(
            'value1',
            'value2',
            'value3'
        )
    )
);

This will generate a string as: my_array[0]=value1&my_array[1]=value2&my_array[2]=value3.

It is easy to add POST parameters in cURL by using the method described in this article. This will help you manage your parameters more efficiently, making your application more secure and robust.

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