Password Strenght PHP

passwordstrenght.php

function scorePassword($password){
	$score=0;
	if(!$password)
		return 0;

	// award every unique letter until 5 repetitions
	$letters=str_split($password);
	$scores=array();
	foreach($letters as $letter){
		$scores[$letter]=(isset($scores[$letter]))?$scores[$letter]+1:1;
		$score+=5/$scores[$letter];
	}

	// bonus points for mixing it up
	$variations = array(
		preg_match('/\d/', $this->password),
		preg_match('/[a-z]/', $this->password),
		preg_match('/[A-Z]/', $this->password),
		preg_match('/\W/', $this->password),
	);

	$variationCount=0;
	foreach($variations as $check){
		$variationCount+=($check)?1:0;
	}
	$score+=($variationCount-1)*10;
	return round($score);
}