Php post json data with curl

How To POST JSON Data with PHP cURL

When working with APIs, it’s common to send and receive data in JSON format. In PHP, you can use the cURL library to send HTTP requests, including sending JSON data in a POST request. In this article, we’ll show you how to POST JSON data with PHP cURL in a step-by-step guide.

Step 1: Set the URL and JSON data

The first step is to set the URL that you want to send the request to and the JSON data that you want to send in the request body. For this example, we’ll use a sample JSON data:

In this example, we’ve created an array of data and encoded it into a JSON string using the json_encode() function.

Step 2: Set the cURL options

The next step is to set the cURL options for the request, including the URL, request method, and request body. Here’s an example of how to set the cURL options:

In this example, we’ve set the following options:

• CURLOPT_RETURNTRANSFER: Set to true to return the response as a string instead of outputting it directly to the screen.
• CURLOPT_CUSTOMREQUEST: Set to “POST” to specify that we’re sending a POST request.
• CURLOPT_POSTFIELDS: Set to the JSON data that we want to send in the request body.
• CURLOPT_HTTPHEADER: Set to an array of headers, including the Content-Type header to specify that we’re sending JSON data, and the Content-Length header to specify the length of the JSON data.

Step 3: Send the request and handle the response

The final step is to send the request using the curl_exec() function and handle the response. Here’s an example of how to do this:

In this example, we’ve used the curl_exec() function to send the request and store the response in the $response variable. We’ve also checked for any errors using the curl_errno() function and displayed the error message if there was an error. Finally, we’ve closed the cURL handle using the curl_close() function.

Step 4: Complete PHP Script

After combining the above code, you will get a full functional PHP script that can POST JSON data to remote APIs.

Save the file content and run this via the PHP command line interface.

Conclusion

In this article, we’ve shown you how to POST JSON data with PHP cURL in a step-by-step guide. By setting the URL and JSON data, setting the cURL options, and sending the request, and handling the response, you can easily send JSON data in a POST request using PHP cURL.

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13 Comments

## Hello everyone, I have a problem I am developing a data submission using the following code i get a:
Error: Failed to connect to 54.193.100.127 port 5175 after 0 ms: Couldn’t connect to server ‘100000000000001’,
‘lattitude’ => ‘17.983601’,
‘longitude’ => ‘-102.357148’,
‘speed’ => ‘0’,
‘angle’ => ‘0’,
‘satellite’ => ‘8’,
‘time’ => ‘2023-06-07 05:56:00’,
‘battery_voltage’ => ’20’,
‘gps_validity’ => ‘A’
); $json = json_encode($datos);
echo $json; echo “”;
echo strlen($json); echo “”; //$url = ‘http://54.193.100.127:5175’; //add curlopt_port
$url = ‘http://54.193.100.127’;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_PORT, 5175);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, “POST”);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
‘Content-Type: application/json’,
‘Content-Length: ‘ . strlen($json)
));
curl_setopt($ch, CURLOPT_POSTFIELDS, $json); $response = curl_exec($ch);
if(curl_errno($ch)) echo ‘Error: ‘ . curl_error($ch);
> else echo ‘Respuesta: ‘; echo $response;
> ?> // But when I use the terminal with the curl command as follows:
curl -X POST -d ‘’ -H “Content-Type: application/json” http://54.193.100.127:5175 //The server responds
Can you help me?

The main thing is that the request must be a POST request with properly json-encoded data in the body. The headers must properly describe the post body.

Is there a way to avoid the auto “Content-Type: application/x-www-form-urlencoded
” when using POST, I mean, I’m using the following code:
//—————————————————————————————————-
$ch = curl_init();
if(!empty($gdxParams))
$curlUrl=$curlUrl.’?’.$gdxParams;
>
$curlOptions=array();
if($gdxMethod==”POST”)
$curlOptions=[
CURLOPT_HTTPHEADER=>[
‘x-api-key: ‘.$gdxApiKey,
‘Authorization: Bearer ‘.$gdxApiKey,
‘Content-Type​: ​application/json’,
],
CURLOPT_URL=>$curlUrl,
CURLOPT_CUSTOMREQUEST=>’POST’,
CURLOPT_POSTFIELDS=>json_encode($gdxArrayParams),
CURLOPT_RETURNTRANSFER=>true,
CURLINFO_HEADER_OUT=>true,
];
>
else//Method GET
$curlOptions=[
CURLOPT_HTTPHEADER=>[
‘x-api-key: ‘.$gdxApiKey,
‘Authorization: Bearer ‘.$gdxApiKey,
],
CURLOPT_URL=>$curlUrl,
CURLOPT_CUSTOMREQUEST=>’GET’,
CURLOPT_RETURNTRANSFER=>true,
CURLINFO_HEADER_OUT=>true,
];
>
curl_setopt_array($ch, $curlOptions);
$response = curl_exec($ch);
/*—*/
$arrayInfo=array();
$arrayInfo[‘header_info’]=curl_getinfo($ch, CURLINFO_HEADER_OUT);
$arrayInfo[‘response’]=$response;
var_dump($arrayInfo);
/*—*/
//————————————————————————————————
But the header info always gets set as:
//—————————————————————————————————————
‘header_info’ => string ‘POST /v1/reservations?tripId=XXXXXXXXXXXXXXXXXX&lang=es&verifyDuplicatedReservations=true HTTP/1.1 Host: stage.ws.gdx.travel Accept: */* x-api-key: XXXXXXXXXXXXXXXXXXXXXX Authorization: Bearer XXXXXXXXXXXXXXXXXXXXXX Content-Type​: ​application/json Content-Length: 221 Content-Type: application/x-www-form-urlencoded
//——————————————————————————————————
If I remove the CURLOPT_POSTFIELDS option, the headers only gets one “Content-Type” line (application/json, the one that I need)
Any clues?

curl_setopt($ch, CURLOPT_HTTPHEADER, array(
‘Content-Type: application/json’,
‘Content-Length: ‘ . strlen($payload))
); You are asking for strlen($payload); which is the string-length while $payload is an array, so that gives an error? Any advise?

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How to Pass JSON Data in a URL using CURL in PHP ?

In this article, we will see how to pass the JSON Data in a URL using CURL in PHP, along with understanding the different ways for passing the data in a URL through the illustrations. The cURL stands for client URL, which allows us to connect with other URLs & use their responses in our code, i.e., it is a tool for sending and getting files using URL syntax. The cURL facilitates the way that can hit a URL from our code to get an HTML response from it. The cURL is also used in command lines or scripts for data transfer. Here, we need to pass JSON data in a URL using cURL in PHP and handle the POST request. This task can be accomplished with the help of the following ways:

We will explore all the above approaches & understand them through examples.

Syntax for passing JSON data in a URL using cURL:

Approach for POST Request:

• We need to specify the URL, where the JSON data need to be sent.
• Using curl_init(), we initialize cURL.
• Put JSON data in a PHP array and set up JSON data.
• And using json_encode() encode it into JSON string.
• Setting the options for the cURL.
  • Fetching $url using CURLOPT_URL.
  • Switching request type from get to post using CURLOPT_POST.
  • Now attach the encoded string in the post field using CURLOPT_POSTFIELDS.
  • Setting the curl option RETURNTRANSFER to true so that it returns the response instead of just outputting it.
  • Using the CURLOPT_HTTPHEADER set the Content-Type to application/JSON.

  Example 1: This example illustrates passing the JSON Data in a URL using cURL in PHP by using the cURL POST Request.

  PHP

  Employee: Aman Job: Data Scientist Company: GeeksForGeeks id: 553 createdAt: 2022-12-02T12:32:42.420Z

  Approach for GET Request:

  • We need to specify the URL, Where the JSON data is going to be sent.
  • Using curl_init() we initialize cURL.
  • Next, we have to set options for the cURL.
  • Fetching $url using CURLOPT_URL.
  • Setting the curl option RETURNTRANSFER to true so that it returns the response instead of just outputting it.
  • Setting multiple options for a cURL session. Using the curl_setopt_array() function, setting a large number of options for cURL without repetitively calling it.
  • Using curl_exec() to execute the GET request.
  • Decode the response and Return the response as a string.
  • Close the cURL.

  Example 2: This example illustrates passing the JSON Data in a URL using cURL in PHP by using the cURL GET Request.

  PHP

  Array ( [page] => 2 [per_page] => 6 [total] => 12 [total_pages] => 2 [data] => Array ( [0] => Array ( [id] => 7 [email] => michael.lawson@reqres.in [first_name] => Michael [last_name] => Lawson [avatar] => https://reqres.in/img/faces/7-image.jpg ) [1] => Array ( [id] => 8 [email] => lindsay.ferguson@reqres.in [first_name] => Lindsay [last_name] => Ferguson [avatar] => https://reqres.in/img/faces/8-image.jpg ) [2] => Array ( [id] => 9 [email] => tobias.funke@reqres.in [first_name] => Tobias [last_name] => Funke [avatar] => https://reqres.in/img/faces/9-image.jpg ) [3] => Array ( [id] => 10 [email] => byron.fields@reqres.in [first_name] => Byron [last_name] => Fields [avatar] => https://reqres.in/img/faces/10-image.jpg ) [4] => Array ( [id] => 11 [email] => george.edwards@reqres.in [first_name] => George [last_name] => Edwards [avatar] => https://reqres.in/img/faces/11-image.jpg ) [5] =>Array ( [id] => 12 [email] => rachel.howell@reqres.in [first_name] => Rachel [last_name] => Howell [avatar] => https://reqres.in/img/faces/12-image.jpg ) ) [support] => Array ( [url] => https://reqres.in/#support-heading => To keep ReqRes free, contributions towards server costs are appreciated! ) )

  Approach for PUT Request:

  • We need to specify the URL, where the JSON data need to be sent.
  • Using curl_init(), we initialize cURL.
  • Put JSON data in a PHP array and set up JSON data.
  • And using json_encode() encode it into JSON string.
  • Setting the options for the cURL.
    • Fetching $url using CURLOPT_URL.
    • Now attach the encoded string in the post field using CURLOPT_POSTFIELDS.
    • Setting the curl option RETURNTRANSFER to true so that it returns the response instead of just outputting it.
    • Using the CURLOPT_HTTPHEADER set the Content-Type to application/JSON.

    Example 3: This example illustrates passing the JSON Data in a URL using cURL in PHP by using the cURL PUT Request.

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    How to POST and Receive JSON Data using PHP cURL

    JSON is the most popular data format for exchanging data between a browser and a server. The JSON data format is mostly used in web services to interchange data through API. When you working with web services and APIs, sending JSON data via POST request is the most required functionality. PHP cURL makes it easy to POST JSON data to URL. In this tutorial, we will show you how to POST JSON data using PHP cURL and get JSON data in PHP.

    Send JSON data via POST with PHP cURL

    The following example makes an HTTP POST request and send the JSON data to URL with cURL in PHP.

    • Specify the URL ( $url ) where the JSON data to be sent.
    • Initiate new cURL resource using curl_init().
    • Setup data in PHP array and encode into a JSON string using json_encode().
    • Attach JSON data to the POST fields using the CURLOPT_POSTFIELDS option.
    • Set the Content-Type of request to application/json using the CURLOPT_HTTPHEADER option.
    • Return the response as a string instead of outputting it using the CURLOPT_RETURNTRANSFER option.
    • Finally, the curl_exec() function is used to execute the POST request.

    // API URL $url = 'https://www.example.com/api'; 
    // Create a new cURL resource $ch = curl_init($url); 
    // Setup request to send json via POST $data = array( 'username' => 'codexworld', 'password' => '123456' ); $payload = json_encode(array("user" => $data)); 
    // Attach encoded JSON string to the POST fields curl_setopt($ch, CURLOPT_POSTFIELDS, $payload); 
    // Set the content type to application/json curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:application/json')); 
    // Return response instead of outputting curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    // Execute the POST request $result = curl_exec($ch); 
    // Close cURL resource curl_close($ch);

    Receive JSON POST Data using PHP

    The following example shows how you can get or fetch the JSON POST data using PHP.

    • Use json_decode() function to decoded JSON data in PHP.
    • The file_get_contents() function is used to receive data in a more readable format.

    $data = json_decode(file_get_contents('php://input'), true); 

    Are you want to get implementation help, or modify or enhance the functionality of this script? Click Here to Submit Service Request

    If you have any questions about this script, submit it to our QA community — Ask Question

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