curl -X POST -H 'Content-Type: application/json' -d to PHP

You can try as below

$data = array("name" => "Hagrid", "age" => "36");                                                                    $data_string = json_encode($data);                                                                                   $ch = curl_init('http://somedomain.com/test.php');                                                                      curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");                                                                     curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);                                                                  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);                                                                      curl_setopt($ch, CURLOPT_HTTPHEADER, array(                                                                              'Content-Type: application/json',                                                                                    'Content-Length: ' . strlen($data_string))                                                                       );                                                                                                                   $result = curl_exec($ch);