a warning displayed in a featured page!

here is the warning i get

Warning: substr() expects parameter 3 to be long, string given in F:\xampp\htdocs\firnatel\wp-content\themes\itworx_II\functions.php on line 1430

and here the code

function phi_custom_excerpt($text, $count) {
$short_excerpt = substr($text, 0, $count);
return $short_excerpt;
}