Taking last character from each line on a file.

So I have tried and tried and just can't get it to work, if somebody could help.. would be great... I have a file and it has many lines, I want to take the last character of all these lines and echo them with each one being on a new line.. obviously this doesnt work and im really quite bad at php.. but it was a attempt.


<?php
$str = file_get_contents("problems.txt");

$arr = explode("*", $str);


foreach ($arr as $value) {
$last = $value[strlen($value)-1];

echo $last;
}



?>

How about
$lines = file("problems.txt");

foreach ($lines as $line) {
$last = substr($line,strpos($line,PHP_EOL)-1);
echo $last.'<br>';
}

Thank you so so much.... =)