logs-json-post.php

<?php

// Parse json body to array
$data = json_decode(file_get_contents("php://input"), true);

// Set logs file destination
$dir = getcwd()."/logs.log";

// Open file logs
$file = fopen($dir,"a");

// Write data into file logs
fwrite($file,print_r($data,1));

// Close file logs
fclose($file);