php couting leters and numbers in an array

<?php



$str = '+0123qq';
$chars = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);
print_r($chars);

echo "<br>";


$num=0;
$letters=0;

foreach($chars as $elements){

if (is_numeric($elements)) {
$num+=1;

}



else{
$letters+=1;

}



}

echo " array got $num  numbers";
echo "<br>";
echo " array got $letters  letters";

?>