vrs_test.php

<?php

  if(isset($argv[1]) && $argv[1] !=null && isset($argv[2]) && $argv[2] !=null ){

    $start_arr =  explode('/',$argv[1]);
    $end_arr =  explode('/',$argv[2]);

    $start_date = $start_arr[2].'-'.$start_arr[1].'-'.$start_arr[0];
    $end_date = $end_arr[2].'-'.$end_arr[1].'-'.$end_arr[0];

    $start_date = strtotime($start_date);
    $end_date = strtotime($end_date);

    if($end_date > $start_date){
      $diff = $end_date - $start_date;
    }
    else {
      $diff = $start_date - $end_date;
    }

    $days = round($diff / (60 * 60 * 24));
    if($days > 0){
      $days = $days - 1;
    }

    print_r($days);
    die;
  }
  else {
    echo "Invalid input";
    die;
  }

?>