SpeakeazyYT18903109

$code=1;
$sc = "bloki_vydvizhnykh_lotkov_1";
$array = Array (
    "0" => "bloki_vydvizhnykh_lotkov",
    "1" => "bloki_vydvizhnykh_lotkov_1",
    "2" => "bloki_vydvizhnykh_lotkov_2",
    "3" => "bloki_vydvizhnykh_lotkov_3",
    "4" => "bloki_vydvizhnykh_lotkov_546546",
);
  
while (in_array($sc, $array)) {
  $sc = substr_replace($sc,$code++,-1);
}
echo $sc;