cli.php

<?php
/**
 *
 * example    php cli.php 2016-09-19 30 0.285714286
 */

if (4 !== $argc) {
	echo 'usage: php ' . __FILE__ . ' [date-stopped (Y-m-D)] [cigarettes per day] [price / cigarette]' . PHP_EOL;
	exit;
}

function getSmokingString(\DateTime $dateStopped, $cigarettesPerDay=0, $pricePerCigarette=0)
{
	$dateInterval = (new \DateTime('now'))->diff($dateStopped);
	$daysWithoutSmoking =intval( $dateInterval->format('%a'));
	$hoursToday = intval($dateInterval->format('%h'));
	$cigarettesNotSmokedToday = round($cigarettesPerDay / 24 * $hoursToday,0);
	$cigarettesNotSmoked = $daysWithoutSmoking * $cigarettesPerDay + $cigarettesNotSmokedToday;
	$moneySaved = $pricePerCigarette * $cigarettesNotSmoked;
	return sprintf('You stopped smoking %d days ago. Saved %d Euro and you didnt\'t smoked %d cigarettes', $daysWithoutSmoking, $moneySaved, $cigarettesNotSmoked);
}


$dateStopped = new \DateTime($argv[1]);
$cigarettesPerDay = $argv[2];
$pricePerCigarette = $argv[3];

echo getSmokingString($dateStopped, $cigarettesPerDay, $pricePerCigarette);
echo PHP_EOL;