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

Last Updated : 29 Mar, 2023

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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:

cURL POST Request
cURL GET Request
cURL PUT Request

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

Syntax for passing JSON data in a URL using cURL:

<?php $url = "https://reqres.in/api/users"; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL,$url); curl_setopt($ch, CURLOPT_RETURNTRANSFER,true); $resp = curl_exec($ch); curl_close($ch);?>

By using the cURL POST Request

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.
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 POST request.
Decode the response and Return the response as a string.
Close the cURL.

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

PHP

<?php

//URL, Where the JSON data is going to be sent

// sending post request to reqres.in

$url = "https://reqres.in/api/users";

//initialize CURL

$ch = curl_init();

//setup json data and using json_encode() encode it into JSON string

PHP

<?php

//URL, Where the JSON data is going to be sent

// sending get request to reqres.in

$url = "https://reqres.in/api/users?page=2";

//initialize CURL

PHP

<?php

//URL, Where the JSON data is going to be sent

// sending put request to reqres.in

$url = "https://reqres.in/api/users/2";

//initialize CURL

$ch = curl_init();

//setup json data and using json_encode() encode it into JSON string

$data = array(

'Employee' => 'Aman',

'Job' => 'Data Scientist',

'Company' => '<b>GeeksForGeeks</b>'

);

$new_data = json_encode($data);

//next we have to set options so below is the options for the curl

$array_options = array(

//set the url option

CURLOPT_URL=>$url,

//attach the encoded string in the post field using CURLOPT_POSTFIELDS

CURLOPT_POSTFIELDS=>$new_data,

//setting curl option RETURNTRANSFER to true so

//that it returns the response

//instead of outputting it

CURLOPT_RETURNTRANSFER=>true,

//Using the CURLOPT_HTTPHEADER set the Content-Type to application/json

CURLOPT_HTTPHEADER=>array('Content-Type:application/json')

);

//curl option for switching the request type from get to post

curl_setopt($ch, CURLOPT_CUSTOMREQUEST,'PUT');

//setting multiple options using curl_setopt_array

curl_setopt_array($ch,$array_options);

// using curl_exec() is used to execute the POST request

$resp = curl_exec($ch);

// decode the response

$decoded = json_decode($resp);

foreach($decoded as $key => $val){

echo $key . ': ' . $val . '<br>';

}

//close the cURL and load the page

curl_close($ch);

?>

Output:

Employee: AmanJob: Data ScientistCompany: GeeksForGeeksupdatedAt: 2022-12-02T12:34:59.262Z

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