Login not redirect to cas ( php7 vs php8 )

<?php
$url ="/test";
$wp_cassify_redirect_url_white_list="";
$is_in_while_list = false;

$white_list_urls = explode( ';', $wp_cassify_redirect_url_white_list );
if ( ( is_array( $white_list_urls ) ) && ( count( $white_list_urls ) > 0 ) ){
foreach( $white_list_urls as $white_url ) {
if ( strrpos( $url, $white_url, -strlen( $url ) ) !== false ) {
$is_in_while_list = true;
}
}
}

echo $is_in_while_list;

Fragment of code is from wp_cassify_plugin.php?

Please check the code above on https://onlinephp.io/

With php7 the result is empty

With php8 the result is always 1