Number 1 is concatenated to the end to array element. How to get rid of this?

[gintare]

I am getting strange behavior:

my url: http://localhost/MVCfirst/public/Contact/email/anoth
if i use command

var_dump($url);

i am getting result:
array(3) { [0]=> string(7) "Contact" [1]=> string(5) "email" [2]=> string(5) "anoth" }
where

$url=explode('/', filter_var( rtrim($_GET['url'],'/') ), FILTER_SANITIZE_URL);

If i use commands:

echo '<pre>', print_r($url[0]), '</pre><br>';
echo '<pre>', print_r($url[1]), '</pre><br>';
echo '<pre>', print_r($url[2]), '</pre><br>';

I am getting as a result words:
Contact1
email1
anoth1
Number 1 is concatenated to the end.

How to get rid of 1 concatenated to the end? Because i need word Contact to proceed to controller file and its methods.

Actually i am following online course:
https://www.udemy.com/learn-php-model-view-controller-pattern-php-mvc/#/lecture/2201044

And they make a line in .htaccess:
RewriteRule ^(.+)$ index.php?url=$ 1 [QSA,L]

Maybe this line is the reason that 1 is concatenated?

[Luuk]

http://php.net/manual/en/function.print-r.php:

"When the return parameter is TRUE, this function will return a string. Otherwise, the return value is TRUE. "

so, when you do:
$b="test"; echo "A",print_r($b) ,"C";

PHP will first print the A
than the value of $b
then the return value of 'print_r($b)'
then the "C"
which is: Atest1C