How to Correctly Read and Parse JSON POST Data in PHP?

Reading JSON POST Data in PHP

When receiving POST data in JSON format, it's crucial to retrieve and parse it correctly in PHP. In your scenario, you encountered issues due to incorrect handling of the JSON POST data.

To resolve this, replace the usage of $_POST with other methods to read the raw input and then decode it as JSON. Here's how you can accomplish this:

Modified PHP on the Receiving Page:

$inputJSON = file_get_contents('php://input');
$input = json_decode($inputJSON, TRUE);

This code reads the raw input as JSON and then parses it into an array that you can access with $input.

Updated CURL Code for Testing:

As mentioned in the response, CURLOPT_POSTFIELDS should be used with JSON-encoded strings for JSON communication. Here's the modified code:

$data_string = json_encode($data);

$curl = curl_init('http://webservice.local/');
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json',
    'Content-Length: ' . strlen($data_string)
));
curl_setopt($curl, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

$result = curl_exec($curl);
$result = json_decode($result);
var_dump($result);

This code correctly sets the HTTP header to indicate JSON content and encodes the data before sending it as JSON.

Additional Note:

It's essential to ensure that the header('Content-type: application/json'); line appears only once on your web service page. If it's called multiple times, it may cause issues in sending the proper header information.

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