Calculate Library Fine (PHP) - php

Question

So, here is the question (https://www.hackerrank.com/challenges/library-fine) I am trying to solve. To solve this, I created a simple function calculateFine and set the conditions to calculate the fine. What's the problem, then? Well, when I run the code on my machine, everything seems fine, but hackerrank won't accept the code. I am new to PHP and concept of functions was a bit confusing for me, but I tried. Below is my code:
<?php
$_fp = fopen("php://stdin", "r");
/* Enter your code here. Read input from STDIN. Print output to STDOUT */
$_a = explode(" ",fgets($_fp));
$_b = explode(" ",fgets($_fp));
// Initialising variable
$_fine = "";
// Calling Function
calculateFine($_a,$_b);
// Defining Function
function calculateFine($actualDate, $returnDate)
{
// Checking various conditions
if ($actualDate[0] <= $returnDate[0] && $actualDate[1] == $returnDate[1] && $actualDate[2] == $returnDate[2])
{
$_fine = 0;
echo $_fine;
}
elseif($actualDate[0] > $returnDate[0] && $actualDate[1] == $returnDate[1] && $actualDate[2] == $returnDate[2])
{
$_late = $actualDate[0] - $returnDate[0];
$_fine = 15*$_late;
echo $_fine;
}
elseif($actualDate[1] > $returnDate[1] && $actualDate[2] == $returnDate[2])
{
$_late = $actualDate[1] - $returnDate[1];
$_fine = 500*$_late;
echo $_fine;
}
elseif($actualDate[2] > $returnDate[2])
{
$_fine = 10000;
echo $_fine;
}
else
{
$_fine = 0;
echo $fine; // Updated (This is the undefined variable causing error )
}
}
?>

Answer 1

It seems there's a newline in $actualDate[2]. So if you trim it you'll get the right answer:
trim($actualDate[2])
But would be better to trim it here already:
$_a = explode(" ",trim(fgets($_fp)));
$_b = explode(" ",trim(fgets($_fp)));

Answer 2

I got it, sorry for the carelessness. The last echo is $fine instead of $_fine. That's why the condition was not matching with some of the test cases. Thankyou.