CF7 input not fetching

<?php
// // accept all post data and make array
$data = json_decode(file_get_contents('php://input'), true);
if (!$data) {
$data = $_POST;
}
var_dump($data); // // get the data from the array
$deal_name = "test";
// $deal_source = isset($data['deal_source']) ? $data['deal_source'] : "";
$contact_first_name = isset($data['yrname']) ? $data['yrname'] : "";
// $contact_last_name = isset($data['contact_last_name']) ? $data['contact_last_name'] : "";
$contact_email = isset($data['yremail']) ? $data['yremail'] : "";
echo $contact_email ;
$contact_phone = isset($data['telephone']) ? $data['telephone'] : "";
$contact_message = isset($data['yrmessage']) ? $data['yrmessage'] : "";

$data_string = json_encode(array(
"custom_fields" => array(),
"email" => $contact_email,
"first_name" => $contact_first_name,
"last_name" => "WA",
"is_public" => true,
"phone" => $contact_phone
));

i use this code code to fetch cf7 data to send to crm. but form data is not being fetched.