php determines whether the password is simple

/((^[0-9]{6,})|(^[a-z]{6,})|(^[A-Z]{6,}))$/ 弱密码
/((^[0-9,a-z]{6,})|(^[0-9,A-Z]{6,})|(^[a-z,A-Z]{6,}))$/  中密码
/^[\x21-\x7e,A-Za-z0-9]{6,}/   强密码

/**
* 检测密码强度
* @param string $pw 密码
* @return int
*/
function _checkPwLevel($pw){
	if(empty($pw)){
		return 0;
	}
	$pattern['weak'] = '/((^[0-9]{6,})|(^[a-z]{6,})|(^[A-Z]{6,}))$/';
	$pattern['middle'] = '/((^[0-9,a-z]{6,})|(^[0-9,A-Z]{6,})|(^[a-z,A-Z]{6,}))$/';
	$pattern['strong'] = '/^[\x21-\x7e,A-Za-z0-9]{6,}/';
	$key ='';
	foreach($pattern as $k=>$v){
		$res = preg_match($v,$pw);
		if($res){
			$key = $k;
			break;
		}
	}
	switch ($key){
		case 'weak':
		return 3;
		case 'middle':
		return 2;
		case 'strong':
		return 1;
		default:
		return 0;
	}
}

$r = _checkPwLevel('123465');
echo $r;
$r = _checkPwLevel('abc1345678');
echo $r;
$r = _checkPwLevel('123456...');
echo $r;

321
// 强 中 弱