<?php
$log_time = date('Y-m-d h:i:sa');
$log_msg = 'how to create log file in php?';
  

$json = file_get_contents('php://input');
//$action = json_decode($json, true);


wh_log($json);
 
function wh_log($log_msg)
{
    $log_filename = 'log';
    if (!file_exists($log_filename)) 
    {
        // create directory/folder uploads.
        mkdir($log_filename, 0777, true);
    }
    $log_file_data = $log_filename.'/log_' . date('d-M-Y') . '.log';
    $path = dirname(__FILE__).'/'.$log_file_data;
    file_put_contents($path, $log_msg . '\n', FILE_APPEND);
}