echo repeatedString("mango", 10);

function repeatedString($string, $number) {
	$ltr = 'a'; //letter function
	$strl = strlen($string);

	$res = substr_count($string, $ltr)*floor($number/$strl);

	$res += substr_count(substr($string, 0, $number%$strl), $ltr);

}
return $res;